Abstract: A convenient weight-adjustable dumbbell, comprising a handle, and two rotating disks, two connecting disks, and two fixed blocks, a flexible shaft is connected to the side of each rotating disk, the flexible shaft surrounds the center of the rotating disk, and the other end of the flexible shaft runs through the connecting disk and the fixed block, an outer side of each fixed block is detachably connected with at least one weight block, one side of each weight block is connected with a lock for connecting the fixed block, the other side of each weight block is provided with a second slot, and each weight block is provided with a insertion hole for—the flexible shaft to pass through.

Abstract: An exercise machine includes a frame which contains a flywheel which rotates around an axle coupled to spools. Original cords are wrapped around the spools and extend to upper pulleys on the frame. The original cords are coupled to adapter cords which extend to lower pulleys on the exercise machine. By pulling the adapter cords, the spools are rotated which causes the flywheel to spin. The adapter cords are released and springs retract the original cords so they can be pulled again. The lower pulleys lower the exit position of the adapter cords so that the exercise machine can be used with hand paddles to simulate swimming, paddle shafts to simulate paddling movements, exercise handles to simulate upper body functional exercises, or ankle straps to simulate lower body functional exercises.

Abstract: A workout device that allows for at home Nordic hamstring curls using a. doorframe or other immovable object is disclosed.

Abstract: An exercise device includes a platform having a surface for supporting a user of the exercise device and a base having a pivot point that defines an axis. In addition, the exercise device includes at least one arm extending from the platform to the pivot point of the base to allow the platform to rotate about the axis defined by the pivot point.

Abstract: A weight adjustable dumbbell includes a handle and a first counterweight part and a second counterweight part respectively arranged at two ends of the handle. Each of the first counterweight part and the second counterweight part includes a plurality of dumbbell pieces. Each dumbbell piece includes a mounting hole. The weight adjustable dumbbell further includes an adjusting mechanism. The adjusting mechanism includes a rotating mechanism, a transmission shaft, a first transmission sleeve and a second transmission sleeve. The transmission shaft can drive the first transmission sleeve and the second transmission sleeve to move axially along the transmission shaft and cause distal ends of the first transmission sleeve and the second transmission sleeve to insert into or leave the mounting holes of portion or all of the dumbbell pieces, whereby the dumbbell pieces are fixed on or detached from the first counterweight part and the second counterweight part.

Abstract: An apparatus and method of using the same for simulating surfing skateboarding, snowboarding or the like. The apparatus comprises a platform capable of supporting a user such as a continuous elastic surface such as trampoline or similar. A support is coupled to the platform for holding the platform. The apparatus further comprises a bearing or similar assembly coupled to the support for allowing the platform to rotate about an axis which is displaced a distance from the user while standing atop the platform during simulation thus simulating bottom and top turns. The apparatus further comprises a stand coupled to the bearing for securely supporting the bearing and tilting the axis of rotation.

Abstract: An arm strengthening device comprises a telescoping rod having a plurality of ergonomic grips at a first end and a removable circular weight perpendicularly disposed at a second end.

Abstract: A dumbbell facilitating weight adjustment is disclosed. The dumbbell includes a dumbbell rod assembly, multiple counterweight disks, and a base for placing the dumbbell rod assembly and the multiple counterweight disks. The dumbbell rod assembly includes a mandrel, fixed disks and gear rotating disks fixed on the left and right sides of the mandrel, positioning rings and multiple coupling flanges. Rotation interference devices for preventing a rotation of the mandrel are provided in the fixed disks. Unlocking devices for unlocking the rotation interference devices are provided on the base. The rotation interference devices include push rods arranged on front sides and rear sides of the positioning rings, pressing rods arranged on upper parts of the push rods and return springs arranged on upper parts of the pressing rods. The unlocking devices include push pillars arranged on the base and cooperating with the push rods.

Abstract: A weight sled for fitness training that uses a plurality of resistance mechanisms to allow for adjustment of resistance. Depending on the configuration, wheel skid or slippage control may be provided by electronic monitoring of the angular velocity of one or more wheels and electronic adjustment of the resistance of any skidding or slipping wheels, bias correction and directional control may be provided by using a plurality of resistance mechanisms via differential adjustment of the resistance of the plurality of resistance mechanisms, and differential adjustment of the resistance mechanisms may be used to manually or automatically offset a directional bias in the sled, ground surface, or the athlete's abilities to keep the sled moving in a linear motion, and to prevent wheel skid on surfaces with differing friction coefficients.

Abstract: Implementations of squat machines may include a seat coupled to a platform, a first foot brace directly coupled to the platform, a second foot brace directly coupled to the platform, a knee brace post coupled to and extending perpendicularly away from a first surface of the platform, a knee brace arm directly coupled to the knee brace post and extending perpendicularly away from a longest length of the knee brace post, and a knee brace directly coupled to the knee brace arm. The knee brace may be configured to contact the front of either a user's knees or shins while performing a squat exercise. The seat may be configured to temporarily contact a buttocks of a user while performing the squat exercise.

Abstract: A drag gain structure for the gravity wheel of fitness equipment includes an eccentric driving member disposed on the first side of the gravity wheel, which includes inner and outer side plate sections, and an interconnecting piece. The interconnecting piece is rotationally coupled to at least one of the plate sections. One end of outer side plate section is fitted over and fixed to the shaft, and one end of inner side plate section is connected to an eccentric position of gravity wheel through the first bias joint pin. A bearing pedestal is disposed on the second side of the gravity wheel, including a bearing screwed on the shaft, a pedestal shell fitted over the bearing and a radial protruding plate on the periphery of pedestal shell. The protruding end of the radial protruding plate is connected to an eccentric position of gravity wheel through the second bias joint pin.

Abstract: An exercise machine handle system for providing a gripping structure that substantially surrounds a stationary or movable exercise platform. The exercise machine handle system generally includes a stationary or movable exercise platform and a perimeter handle surrounding the exercise platform. A space is formed between an outer edge of the exercise platform and an inner edge of the perimeter handle that allows a plurality of fingers of an exerciser to extend through.

Abstract: An exercise device includes a shuttle configured to translate along a first and a second cable in response to a separation of the cables by a user. The cables may extend along first and second cable slots that extend through a shuttle housing between first and second sides of the housing. First and second pulleys may be rotatably mounted to the housing and include corresponding first and second engagement surfaces configured to engage respective the first and second cables within the respective first and second cable slots. Separation of the cable ends, proximate to the first side of the housing, relative to the first and second cable slots drives rotation of the pulleys and corresponding translation of the shuttle along the cables, away from the separating cable ends.

Abstract: An adjustable dumbbell includes a base, a grip, and a plurality of sets of dumbbell plate assemblies connected on both sides of the grip. The dumbbell plate assembly includes a rotating member, an adapter, a limiting member and a weight plate. The rotating member rotates with the grip. The limiting member is located between the rotating member and the adapter. The limiting member fits with and is connected to the adapter in a non-rotatable manner. When the rotating member rotates, the rotating member abuts against the abutting rib to drive the limiting member to translate, so that the protrusion is inserted into or separated from the insertion hole to connect or separate the limiting member and the adapter.

Abstract: An ankle exerciser for exercising a user's ankles and includes a base, two pedals and two rotary units. The pedals and the rotary units are installed to the base. The rotary units are located between the base and the pedals so as to allow the pedals to be pivoted in multiple directions so as to stretch the ankles, and to keep ankles healthy.

Abstract: An exercise machine which includes a centralized spring box and multiple gripping surfaces with which an exerciser may perform a wide range of exercise moves. The exercise machine includes a movable carriage and platform on a track. Bias members may be connected between the carriage and various structural elements of the exercise machine so as to impart a resistance force against movement of the carriage. An outer handle may be positioned around a carriage platform so as to surround the carriage platform. Inner handles may be positioned between the carriage platform and the outer handle, with the inner handle(s) being connected not to the outer handle or the carriage platform, but to an underlying support assembly. A pair of end handles may extend outwardly from the ends of the exercise machine. A bias member retainer such as a spring box may be centrally-located along the length of the exercise machine.

Abstract: Using a combination of jump rope, resistance band and boxing fitness instruments, one can get a robust anaerobic and aerobic exercise experience. However, traditional jump rope equipment requires the operator to be in a location that has ample height and space around them to accommodate the range of the rope being swung around the body. In addition, the ground surface that a traditional jump rope would be hitting may not always be ideal such as carpet, sand, and the like which diminishes the rhythm of the workout. The single unit multi-purpose jump fitness, boxing training and resistance strength device described herein eliminates the need for most of these restrictive considerations as there is no “rope” to jump over when in jump rope workout mode. Rather, the operator swings two specialized end handle units in a “jump rope” fashion while holding adjustable jump handles.

Abstract: A reformer exercise apparatus is disclosed that has a generally rectangular frame, a carriage movably supported on the frame, and a foot support member supported by the side rail portions of the frame. The foot support member has an inverted U shape carbon fiber tube having ends each fixed to a foot bar support member having a cylindrical base, a cylindrical post welded to the base, and a foot bar support arm welded to one end of the cylindrical base, for connection to a foot support assembly operable to selectively position the foot support member at various positions along the side rail portions of the frame.

Abstract: A rehabilitation feedback system is used during rehabilitation of one or more body appendages of a user. The system includes four finger tracking elements and a thumb tracking element supported for movement relative to one another so as to allow a user to performs a gripping motion when the elements are coupled to the fingers and thumb of a user. A biasing member provides a resistance force acting to urge each tracking element towards a starting position thereof. A visual barrier is adapted to hide the hand of the user at a first side of the visual barrier from direct visual sight by the user at a second side of the visual barrier. A sensor at the first side of the visual barrier detects movements of the tracking elements and communicates with an indicator element detectable by the user from a second side of the visual barrier.

Abstract: A novel rowing machine attachment includes a bracket for attaching to a roller assembly of a rowing machine and a receiver for attaching to a handle of a rowing machine. In a particular embodiment, the bracket fixably attaches to the roller assembly and the receiver releasably attaches to the bracket for selective use. In a more particular embodiment, the bracket and the receiver are both integral parts of a single rigid body structure.