Abstract: A dumbbell with adjustable weight essentially includes a handle, two first weight blocks, two second weight blocks, and two position-limiting elements. The handle has a gripping portion and two arms protruding outward from the gripping portion. The first weight blocks are removably disposed around the arms of the handle, respectively. The second weight blocks are removably disposed around the first weight blocks, respectively. The position-limiting elements abut against the second weight blocks ends, respectively. Hence, a user can adjust the total weight of the dumbbell by changing or removing the second weight blocks.

Abstract: Weighted and stackable exercise device includes a body defining a hollow cavity opening at a first edge thereof. The body has a side wall having at least one cut-out. An outwardly projecting rim is on the tubular portion of the body. A handle is in the cavity. The rim provides a first grip for a user during use of the exercise device and the handle provides a second grip for the user. By providing two different grips on the same weighted exercise device, a user can safely and efficiently perform a larger variety of exercises in comparison to using conventional exercise devices that include a single type of grip. The user can pass their fingers and hand from an exterior of the device through each cut-out and over the rim to grip the device in another manner and perform more and different exercises.

Abstract: Weightlifting system for doing arm curls having a frame, a seat mounted on the frame for supporting a person using the system, a pair of posts extending upwardly and rearwardly from the front portion of the frame, an arm rest panel mounted on the posts in front of the seat for engagement by the upper arms of a person on the seat, a pair of weight stands positioned next to the legs in front of the arm rest panel, a bar extending between the weight stands in position to be grasped in the hands of a person sitting on the seat with the backs of the upper arms of the person resting against the arm rest panel, and a plurality of weight plates disposed on each of the stands for selective attachment to the bar.

Abstract: A Dumbbell of the invention utilizes cylindrical detachable weights that fit themselves over previously attached weights. This design allows a user to maneuver the dumbbell with a lower risk of the dumbbell bumping into a user's body.

Abstract: A selectorized dumbbell comprises a plurality of nested weights which have front and rear arrays of rails with the rails being vertically spaced from one another with a space beneath each rail. A handle is insertable into a gap between stacks of nested left and right weight plates. A selector comprises front and rear pin arrays in each end of the handle with the pins in these arrays being selectively movable in a horizontal direction into extended positions located in the spaces beneath the rails for coupling different weights to the handle. The pins in the arrays are movable into their extended positions by a single vertically movable member carried on a vertically rotatable shaft in the handle end or by a plurality of independently movable members in the handle end that are moved by a plurality of keys carried on a top side of the handle end.

Abstract: A hand held exercise device that is ergonomically friendly, is usable for any type of exercise of user choice. The device is most versatile and more importantly allows for complete smooth rolling motion. The overall unusual results are achieved because of the construction and inclusion of a partial sphere shaped bottom section. This novel feature allows for side to side tilting and/or vertical and horizontal movement simultaneously. Also the device includes numerous accessory optional features of choice.

Abstract: Weighted exercise device includes a generally hemispherical body defining a hollow cavity opening at a first edge of the body, and an outwardly projecting rim arranged on the body proximate to the first edge. A handle is arranged in the cavity. The rim provides a first grip during use of the device and the handle provides a second grip during use of the device. By providing two different grips on the same weighted device, and due to the symmetrical rounded shape, with a low center of gravity, the weight is evenly distributed around a user's hands, and a user can safely and efficiently perform a larger variety of exercises in comparison to using conventionally shaped exercise devices that include only a single type of grip.

Abstract: Detailed are exercise devices including soft-sided kettlebells. The devices may be weighted variably yet retain all functionality of existing rigid-sided kettlebells. Nesting of internal components may reduce, if not prevent, relative movement of the components when a kettlebell is in use.

Abstract: A dumbbell with an arched handle includes two weighted elements positioned on either side of a handle having an arched center portion. The shape of the arch facilitates a complete range of motion and training of the biceps, triceps and forearm muscles through a full rotation of the hand utilizing pronation and supination exercises.

Abstract: The present invention relates to an ergonomically shaped kettlebell apparatus that saves the user's hands and wrists from common injuries that occur during kettlebell workouts. The kettlebell includes one or more handle cutouts and an angled backside. The handle cutouts are shaped to reduce the heavy friction that kettlebells apply to the user's hands, especially the outside of the pinky fingers during a two handed kettlebell swing, which typically causes friction hotspots. The angled backside shaves down between approximately a quarter of an inch to two inches off the back half of the kettlebell, such that it is shaped to reduce the stress and impact placed on the back of the user's wrist and forearm during a kettlebell flipping motion such as a one handed kettlebell snatch or when the kettlebell is held in an upright position, which typically causes wrist and forearm injuries.

Abstract: A kettlebell comprising a handle and a main body portion. The handle comprising a loop handle having a grip portion and first and second arm portions extending from opposite ends of a centre portion attaching the grip portion of the handle to the cast body portion. The arm portions have distal ends and the cast main body portion is cast around the distal ends of the handle arms. The main body weight portion is cast around a portion of the handle to thereby secure the handle to the cast main body portion. The body portion is cast onto the end of the handle such that the body portion is both formed and attached to the handle in a single operation thereby providing a secure connection between the main body and the handle. The body may only become detached from the handle through fracture of the handle or the body.

Abstract: An apparatus to store and facilitate the safe simultaneous use of dumbbells by multiple individuals. The apparatus includes first and second staging stations. The first staging station includes a first side, a second side, and first and second spaced apart towers. An individual can walk from the first side of the staging station to a position between the first and second towers with the individual's entire body in a space intermediate the towers. The second staging station includes a primary side, a secondary side, and spaced apart third tower and fourth towers. The second staging station is positioned normal to the first staging station such that a first individual in the first staging station can grasp dumbbells on an outwardly facing tier of the fourth tower of the second staging station at the same time a second individual is standing between the third and fourth towers of the second staging station.

Abstract: A dumbbell caster assembly comprises a first omnidirectional wheel assembly mechanically coupled to a grip. A second omnidirectional wheel assembly is mechanically coupled to the grip.

Abstract: Exercise weight bars are disclosed that provide an easy and efficient way for a user to quickly remove, add, and secure weight plates to the exercise weight bars. The exercise weight bars provide weight locks that may remain attached to the exercise weight bar during the interchange of weight plates. The exercise weight bars can accept one or more weight plates on the ends thereof. The weight locks includes extension members that engage the weight plates when the weight locks are rotated to a locked position, thereby securing the weight plates to the exercise weight bar. When the weight locks are rotated to an unlocked position, the extension members are retracted to disengage the weight plates, thereby allowing the weight plates to be removed from the exercise weight bar.

Abstract: The present invention relates to a new handle for adapting kettlebell weights and for new modes of lifting weights.

Abstract: In a method for adjusting the weight-training mass of a weightplate device, a weight plate is added to the exterior of the weight plate mass so that a magnetic pole region carried by the added weight plate is magnetically coupled to the weight plate mass to magnetically secure the added weight plate to the dumbbell. When decoupling is desired, the added weight plate is rotated with respect to the weight plate mass to bring the carried magnetic pole region into alignment with a magnetically non-attracting portion of the weight plate mass so that the added weight plate can be removed from the weight plate device without overcoming the magnetically-securing coupling force. In a variation of the method, the added weight plate is rotated to bring its carried magnetic pole into sufficient alignment with a pole of like polarity carried by the weight plate mass so that the added weight plate is magnetically repelled.

Abstract: For use with a dumbbell having a transverse connection or connections between two weights, a support structure comprising an elongated handle bar, and means associated with the transverse connection or connections providing releasably connection or connections to the two weights. A preferred clam-shell form of the invention is disclosed.

Abstract: A weight lifting system includes a handle unit having a handle bar, two head units attached to two end sections of the handle bar in a manner that allows the two head units to rotate about a longitudinal axis of the handle bar, two screw rods disposed through holes in the two head units into hollow sections in the handle bar, wherein the two screw rods have threads of opposite directions, two thread-engaging mechanisms fixedly disposed at the two end sections of the handle bar to fit snugly on the threads of the two screw rods, and a lock mechanism disposed in a head unit for controlling rotation of the handle bar; and a plurality pairs of weight discs, wherein each of the weight discs has a center hole configured to accommodate one of the two screw rods.

Abstract: A barbell or dumbbell or exercise device includes a handle having two end portions, a weight member attached to either of the end portions of the handle and having a ball guiding raceway for engaging with a rolling device which is movable along the ball guiding raceway of the weight member for generating a vibration to the weight member and the handle, the weight member includes a housing attached onto the weight member and engaged with the rolling device for retaining the rolling device in the weight member, for example, the housing includes a chamber for receiving the weight member and includes a peripheral flange extended radially and inwardly into the chamber and secured to the weight member.

Abstract: A dumbbell having an antimicrobial handle comprises a bar having a pair of end regions, and extending generally longitudinally therebetween along a generally central axis, weight plate masses mounted at the end regions and mechanically secured thereto, and a pair of collars located at longitudinally opposed positions on bar to define a handle region therebetween. A handle is located within the handle region and includes a generally tubular supporting substrate positioned about the bar, and a generally tubular grip surface member supported by the substrate and formed from an antimicrobial copper alloy, the supporting substrate and generally tubular grip surface member extending generally axially between longitudinally spaced-apart end regions. The collars have axially-inwardly extending flange portions sized and structured to substantially circumscribe the end regions of the grip surface member and to securely capture the end regions between the flange portions and the bar.

Abstract: A dumbbell of the present invention includes: a handle portion having a flattened cross section; and at least two weight portions provided at opposite ends of the handle portion. The handle portion is connected to an off-center position deviating from a center-of-gravity portion of each of the weight portions.

Abstract: A kinetic dumbbell of the present invention includes a handle and two weight devices connected to opposite ends of the handle. Each of the weight devices has an annular channel and at least a ball received in the annular channel. The balls are running in the endless annular channels to provide an extra vibration effect while training with the kinetic dumbbell of the present invention.

Abstract: An exercise device, for example a dumbbell or barbell, for weightlifting and other fitness activities, which includes a lifting bar having an axis and opposed axial ends, and a pair of weight sections mounted spaced apart on the respective opposed axial ends of the lifting bar. The lifting bar extends between the spaced apart weight sections defining a handle. Each weight section has an outer circumferential surface, one embodiment in which is a barrelled shape to match arid fit in the palm of a user's hand. The circumferential surface of at least one of the weight sections comprises a plurality of grooves, each extending generally circumferentially around only part of the outer circumferential surface of the weight section and spaced substantially axially from an adjacent groove. The sets of grooves define grip areas on the weight section to enable a user to better grip and lift the exercise device.

Abstract: The current application is directed to a multi-grip dumbbell. One example multi-grip dumbbell includes a central dumbbell handle, a first weighted head interconnected to the central dumbbell handle in proximity to a first end of the central dumbbell handle, and a second weighted head interconnected to the central dumbbell handle in proximity to a second end of the central dumbbell handle. The first weighted head has approximately the same weight as the second weighted head. The first weighted head includes a first end dumbbell handle and two side dumbbell handles. Similarly, the second weighted head includes a second end dumbbell handle and two side dumbbell handles.

Abstract: A dumbbell comprises a bar that extends generally axially between opposing end regions, a weight plate mass mounted about the bar at each end region, means for retaining the mounted weight plate mass at the respective end regions to define a handle region axially inward of the end regions that can be gripped by a user during exercise movement of the dumbbell, means for mechanically securing the weight plate mass to the dumbbell, said bar extending sufficiently axially outward of the mechanically secured weight plate mass to accommodate an incremental weight plate mounted about the bar axially outward of the mechanically secured weight plate mass, means for magnetically securing a magnetically responsive incremental weight plate to the dumbbell via magnetic attraction unless the mounted incremental weight plate has been rotated about the bar to a decoupling position, and means for establishing a decoupling position in which there is no magnetic attraction between the mounted incremental weight plate and the du

Abstract: A dumbbell has an optional number of weight discs which stand on end in a stand, and a handle with anchorages. The anchorages and the weight discs have connecting structures which, in the axial direction, interconnect the anchorages with a neighboring weigh disc or neighboring weight discs, respectively. On the other hand, the connecting structures permit movement transversely of the axial direction. The weight discs display locking structures, which, in the activated state in directions transversely of the axial direction, prevent mutual movements between the weight discs and the anchorages. The locking structures have locking bodies which are movable so that their directions of movement have an axial component and which are disposed at the peripheral regions of the weight discs, and also are insertable in corresponding recesses in a neighboring weight disc or an anchorage. The locking bodies are operable by an operating arrangement located inside the peripheral contour of the weight discs.

Abstract: A multifunction dumbbell includes a handle comprising two projections on both ends respectively; two hollow weight members each comprising a protrusion extending toward the handle; two spacer sleeves each comprising a closed flange fixedly secured to a joining portion of the handle and either projection, the spacer sleeves fixedly fastened between the protrusions and the projections; two rings each having an inner diameter less than an outer diameter of the weight member so that the rings can be put on the weight members and retained thereon respectively; two half-spherical members each fixedly secured to the ring and complimentarily engaged with the weight member; and two truncated conic springs each put on the protrusion and a portion of the weight member to be retained between the spacer sleeve and the ring. The rings and the half-spherical members together are adapted to rotate about the weight members.

Abstract: A dumbbell having an antimicrobial handle comprises a bar having a pair of end regions, and extending generally longitudinally therebetween along a generally central axis, weight plate masses mounted at the end regions and mechanically secured thereto, and a pair of collars located at longitudinally opposed positions on bar to define a handle region therebetween. A handle is located within the handle region and includes a generally tubular grip surface member supported by the bar and formed from an antimicrobial copper alloy, the generally tubular grip surface member extending generally axially between longitudinally spaced-apart end regions. The pair of longitudinally-spaced generally annular collars have axially-inwardly extending flange portions sized and structured to substantially circumscribe the end regions of the generally cylindrical grip surface member and to securely capture the end regions between the flange portions and the bar.

Abstract: This invention relates to a selectorized dumbbell having a handle that can be dropped down between nested left and right stacks of weight plates. The weight plates can comprise individual weights or a pair of weight plates, one from each stack, can be connected together to form a single weight. A selector is provided to allow the user to select a desired number of weight plates from each stack and couple such weight plates to the handle to provide an adjustable weight dumbbell. Each weight includes a weight frame having at least one carrier to which a commodity weight can be fastened. The dumbbell can be shipped by the manufacturer with empty weight frames to reduce shipping costs. When the dumbbell with empty weight frames reaches a destination, the dumbbell can be completed by securing commodity weights to the carriers on the respective weight frames.

Abstract: The present invention provides a multidirectional exerciser for hand, wrist and forearm comprising a handle having an axial opening through which a bolt extends. A spring means is around one end of the bolt disposed against an adjustment ring. A resistance knob is mounted on the adjustment ring. A pressure plate is mounted at the opposite end of the handle between the handle and the head of the bolt. At least one clutch disc is disposed against the pressure plate. A knob is mounted around the pressure plate and clutch disc, mounted for relative rotational movement with respect to the handle. The wrists and hands are exercised by holding the handle in one hand and the knob/grip member in the other hand, and repetitively twisting the handle and knob/grip member in opposite directions. A detachable grip member is mounted over said knob and the detachable grip member further comprises a gyro ring and a squeeze grip strengthener.

Abstract: In one aspect of the disclosed embodiments, an inertial exercise device has an elongate member with opposing first and second end portions, and a sleeve movably coupled to the elongate member and disposed between the first and second end portions of the elongate member. A first elastic resistance element interfaces between the elongate member and the sleeve. A user-induced rhythmic movement of the sleeve along the elongate member alternatively toward the opposing first and second end portions causes the first elastic resistance element to alternately compress and extend as the first and second end portions of the elongate member oscillate relative to the sleeve.

Abstract: A handheld, vibratory exercise device with a handle that has a low center of gravity and selectively removable modular weights for incorporating an adjustable and additional resistance. The present invention is a vibratory system with a hand-held resistance device that may have a pendulous shape of “low center of gravity” or “low center of mass” and adjustable weights and thereby provides the opportunity for a unique, multi-faceted neuromuscular load.

Abstract: A dumbbell includes a bar, an axle, two weights and two cover. The bar includes a holding portion and two enlarged reception members connected to two ends of the bar. The axle extends through a passage of the bar and each reception member has a space for reception of the weight. Each weight includes a ridge and a weight body, the ridge is connected between the axle and the weight body. The two covers are respectively connected to the reception members to cover the two respective spaces. The weights are rotatable during using the dumbbell and the rotation exercises more muscles of the user's body.

Abstract: An exercise grip and method for performing a low cable pectoral muscle development exercise is disclosed wherein the exercise grip is attachable to a cable weight system. The exercise grip includes a body substantially formed to receive thereon the palmer side of a human hand. The body has an upturned flange formed at an outer edge of the body to bear against the ulnar border of a human hand. An elongate finger grip extends from and is oriented substantially perpendicular to the upturned flange and is formed to accommodate the curled fingers of a human hand therearound. A thumb recess is adjacent to the finger grip opposite from the upturned flange for allowing a human thumb to bear thereagainst. A hook is affixed to the body proximate to the thumb recess to facilitate attachment to the cable of the cable weight system.

Abstract: An adjustable weight training device includes a core unit which has a substantially flat, rotatable, base with a pair of sides extending away from the base, the sides separated from each other so as to provide for attachment of a handle across the sides, wherein the handle is positioned above the base and dimensioned for gripping by a user's hand. The sides of the core unit include arm cradle regions which are dimensioned for removable receipt of an arm, wherein the arms are dimensioned for removable attachment to the arm cradle regions in the sides of the core unit and extend away from the sides so as to provide for gripping by a user's hand. The arms can be selectively attached to the arm cradle areas and to each other so as to create different configurations of the weight training device.

Abstract: A selectorized dumbbell has a handle that can be inserted into a gap between stacks of nested left and right weight plates. A selector determines how many left weight plates are coupled to the left end of the handle and how many right weight plates are coupled to the right end of the handle. Each weight plate is held between a pair of flexible arms on a forked carrier. The arms allow the weight plates to deflect out of a normal, substantially upright, orientation if an impact shock is delivered to the dumbbell. The arms are restored to their normal orientation once the impact shock dissipates. Alternatively, the weight plates may comprise a metallic inner weight plate covered with an elastomer encasement and with an integral elastomer lug attaching the weight plates to at least one interconnecting member. The selector may comprise a connecting pin with at least one flexible shock absorbing prong.

Abstract: A dumbbell assembly includes at least one bar and a disk is fixedly connected to the at least one bar. The disk has a reception portion. A rotatable unit is engaged with the reception portion of the disk. An arm has an insertion which is connected to the rotatable unit and a disk is connected to the arm. At least one weight member is connected to the wing. The user holds the at least one bar and operates the dumbbell assembly, the wing together with the weight member are rotated about the at least one bar to generate centrifugal forces which exercise the user's muscles.

Abstract: A handheld flexible exercise device intended for human use in which an exercise device is held in each hand with each exercise device bending in response to the movement of an individual's hands and arms when performing an exercise such as walking or an aerobic exercise such as step aerobics. In addition, the flexible exercise device contains metal particles in the core of the device which will move back and forth freely inside the exercise device adding to the exercise benefits by increasing the weight and increasing resistance through the dynamic movement of the metal particles plus creating a noise that can allow an individual to achieve more benefit from an exercise such as walking to enhancing better coordination in the movement of one's hands and arms with the simultaneous movement of one's legs as in walking by trying to achieve a consistent noise level during the exercise.

Abstract: An adjustable weight kettlebell includes a weight lifting member that houses a vertical stack of weights. Shelves on the housing portion of the weight lifting member are rotatable into and out of underlying engagement with respective weights.

Abstract: Weight plate locking and lifting systems by which one or more weight plates are detachably connected to a lifting handle bar to enable the weight plates to be removed from or returned to a nearby storage rack without having to lift, transport and handle the weight plates. Each weight plate includes a toggle lever switch arm that is coupled to a locking pin. Each weight plate also includes a radially-extending locking cavity within which to removably receive the lifting handle bar. When the toggle lever switch arm is moved to a locked position, the locking pin slides in a first direction through the weight plate and into engagement with the lifting handle bar within the locking cavity. When the toggle lever switch arm is moved to an unlocked position, the locking pin slides in an opposite direction out of engagement with the lifting handle bar.

Abstract: An adjustable dumbbell includes a handle, a shaft rotatably engaged through the handle, a carrier attached to each end portion of the shaft and having an inner housing and an outer housing and one or more middle housings spaced from each other for forming two or more gaps between the housings and for engaging with weight members, and the inner housing and the middle housing each include a spring-biased projection extendible into the gaps for selectively latching the weight members to the handle and the shaft and the carrier, and a control device is rotatably engaged onto the shaft and coupled to the handle for actuating the spring-biased projections to latch the selected weight members to the handle and the shaft and the carrier.

Abstract: A weight container, which includes an adjustable calibrating bellow including two outer ribs and at least one inner rib; wherein the outer ribs may collapse and fold around the inner rib; a locking apparatus located adjacent to one outer rib; and a cover receiving apparatus located adjacent to the other outer rib. Further, a pair of weight containers may be connected to a crossbar to define an exercise apparatus. The weight container may further be adapted to engage a base to define a drinking apparatus.

Abstract: An improved exercise device in the nature of a kettlebell. The device has a frame covered by a shroud that is configured to lessen the impact of the device on the user. There are a plurality of weights that can be easily attached and detached from the frame to increase or lessen the load to the user. The weights are designed so that they can be added or taken away without altering the center of gravity of the device or the external physical shape of the device. There is also a base that holds the device while the weights are being changed and which also interacts with the device to assist in that exchange. The attaching and detaching system includes a pin that is used to affix the weights to the frame. A dual locking system assures that the pin does not inadvertently come loose during use of the device.

Abstract: A selectorized dumbbell has nested stacks of left and right weight plates, a handle that can be disposed between the two stacks of weight plates, and a selector that couples selected numbers of the left and right weight plates to left and right planar ends of the handle. The handle has at least one loop type hand grip located above the ends of the handle and above the weight plates to allow the dumbbell to be used as a kettlebell. This loop type hand grip can be replaced with a bar type hand grip if the dumbbell is to be used like a standard dumbbell, or the handle can be provided in kettlebell or standard versions thereof. Alternatively, the loop type hand grip can be movably disposed on the handle for movement between operative and non-operative positions.

Abstract: A rigid adjustable hand weight system for use in physical fitness exercise consisting of a rigid flat handle portion with rigid flat weight members disposed on either end whose size and shape are such that two or more units may be bundled together and held within the user's hand secured together by the user's grip. Each unit may be held singularly or in a group with one or more other units in various combinations to create a hand weight bundle of the desired poundage. For instance, units weighing 2, 3 and 4 pounds may be lifted singularly or combined as necessary to create 5, 6, 7 and 9 pound weight combinations as the user desires. Eliminated is the need for fasteners such as screws, pins or other means since the user's grip provides the force that keeps the units bundled together.

Abstract: An adjustable weightlifting device having selectable weights. The adjustable weightlifting device allows users to select a desired number of weight plates, and then couples the selected weight plates to retention members disposed in the handle of the device.

Abstract: A dumbbell is described including a handle having a grip and at least one end, an inner plate mounted on the handle adjacent the grip, in a fixed rotational orientation, a support plate rotationally mounted on the handle adjacent the inner plate, at least one collar rotationally mounted on the handle adjacent the support plate, and rotationally fixed with the support plate, a selector knob rotationally mounted on the handle adjacent the at least one collar, and rotationally fixed with the collar, a weight plate removably mounted on the handle adjacent the at least one collar, and a means for selectively securing the support plate to the inner plate to resist the rotation of the support plate, collar and selector knob with respect to the inner plate and handle.

Abstract: Exercise dumbbells are made with weights at opposite ends of a handle member. Exercise kettlebells are made with weights beneath a handle member. The weights may be selectively connected to the handle members using knobs and springs, for example, to alternatively hold the selector members in weight engaging positions and weight releasing positions. The dumbbells and the kettlebells may be made using some of the same components.

Abstract: A dumbbell having adjustable inertial resistance load in the field of athletic sports devices is disclosed. The structure of the present invention is characterized in that the hand grip of the dumbbell is provided inside with a rotatable main shaft, the two swing hammer rods and the swing hammers at both ends of the main shaft constitute a normal pendulum, and the two pendulums at both ends of the main shaft are connected through the main shaft, so as to be functionally combined into the function of one eccentric pendulum. The main shaft, the two swing hammer shafts and the swing hammers constitute an eccentric pendulum. The two pendulums fixed at both ends of the main shaft may be adjusted at different angles. In case the angle between the two pendulums is zero degree, upon the rotation of the pendulums, the forces between the hand grip and the hand, besides the mutual force in the up-and-down direction, also include the periodic inertial force in the fore-and-aft direction.

Abstract: An adjustable weight kettlebell includes a weight lifting member that rests on top of a vertical stack of weights. A weight selector is rotatable into and out of underlying engagement of the weight plates to secure a desired amount of mass to the weight lifting member.