A shelving system has a plurality of support posts and one or more shelf assemblies, each shelf assembly having a height adjustment mechanism. A height adjustment mechanism can include a bracket attached to a shelf portion, wherein the bracket includes a channel for receiving a support post, and a latch element pivotably attached to the bracket. The latch element pivots between a first position in which the latch element engages an aperture in the support post to support the shelf assembly on the support post, and a second position in which the latch element is out of the aperture to allow the shelf assembly to move along the support post. The latch element can include a hook with a notch positionable to receive an edge of the aperture, and a side face positionable to rest or press against the support post.

A mounting system for attachment exercise machine accessories wherein the mounting bracket is a separate piece that can be attached to the exercise machine prior to mounting of the accessory on the mounting bracket. The mounting bracket can be adapted to mount to existing exercise machines, and is easy to attach to an exercise machine separately from accessories to be mounted on it. The mounting bracket facilitates attachment of interchangeable accessories through a simplified mounting system that allows the user to keep both hands on the accessory during mounting. Play in the interface between the mounting bracket and accessory is taken up by a tensioning and locking device.

An organizer includes a support body and organizing member mounted to the support body. The organizing member is slidable relative to the support body. A locking mechanism locks a position of the organizing member relative to the base. The locking mechanism includes a first locking member and a second locking member. The first locking member is secured by the support body and is rotatable about an axis defined by the first locking member. The first locking member includes a first engaging feature. The second locking member is provided on the organizing member and includes a second engaging feature. The first locking member is rotatable about the axis between an unlocked position where the first and second engaging features are separated and a locked position where the first and second engaging features are engaged.