Abstract: A shell assembly configured for holding one or more weighted articles includes an outer shell having an outer surface and an inner surface defining a cavity configured for receiving the article(s) therein, with an opening providing access to the cavity, a closure configured for selectively opening and closing the opening, and a securing structure configured for securing the article(s) within the cavity to limit movement of the article(s). The securing structure includes a plurality of adjustable straps each connected to the inner surface of the outer shell at a first securing point and a second securing point on opposite sides of the opening. Each of the straps is adjustable with respect to the outer shell to increase or decrease an effective length of the respective strap between the respective securing points, to increase or decrease a distance between the respective securing points and thereby constrict or expand the outer shell.

Abstract: A roller assembly includes a roller body having a rounded outer surface, an end opening, and an internal cavity extending inwardly along an axial direction from the end opening and configured to receive a weight assembly including one or more weights, a weight holder received within the cavity and configured for holding the weight assembly within the cavity, and a retaining structure engaged with the roller body to retain the weight holder and the weight assembly within the cavity. The weight holder includes first and second engaging members to engage first and second ends of the weight assembly that are spaced in the axial direction, to limit movement of the weight assembly along the axial direction. At least one of the first and second engaging members is positionable in different axial positions relative to the other, such that the engaging members can accommodate changes in size of the weight assembly.

Abstract: A plyometric box for includes a platform, a first pair of opposed sidewalls, and a second pair of opposed sidewalls. Each sidewall extends downwardly from the platform, and includes a first side, an opposed second side, a first pair of stacking ribs on an interior surface of the sidewall proximate the first side, and a second pair of stacking ribs on an interior surface of the sidewall proximate the second side. Each stacking rib extends downwardly from the platform along the sidewall and a bottom surface of each stacking rib is spaced upwardly from a bottom edge of the sidewall.

Abstract: A weightlifting machine that includes a pulley system and a cable system that attaches to a weight rack frame to allow a user to perform a weightlifting exercise. The pulley system may include a first pulley and a second pulley where the cable system engages each pulley. The cable system may have a first end connected to a grip attachment and a second end attached to a resistance element. The resistance element may include a resistance band, a weight support that holds a weight plate, a set of weight plates, or other type of resistance element. The cable system may extend from the pulley through an opening located one of the frame members that form the frame.