An exercise apparatus includes a pair of handle elements and a pair of housing elements. Each handle element includes a manually grippable bar and a base portion having a substantially spherical contact surface. Each housing element is substantially hemispherical and has a substantially central window. Each handle element is releasably locatable within a housing element to form a substantially hemispherical handle body in which the contact surface of the handle element is located within the window of the housing element and provides a contact point about which the housing body is rotatable when located on a support surface.

A biceps curl machine is described. The biceps curl machine includes: a resistance element; a user support coupled to the resistance element; a first movement element coupled to the user support; and a second movement element coupled to the user support. A biceps curl machine includes: a cable resistance element adapted to allow for a resistance path that is at least partly defined by a user; a user support adapted to move along a movement path as a biceps curl is performed; and a load including a set of plates that may be selectively coupled to the cable resistance element. A lateral raise machine includes: a cable resistance element adapted to allow for a resistance path that is at least partly defined by a user; a user support adapted to move along a movement path as a lateral raise is performed; and a load including a set of plates.

An exercise balance board may have at least a platform for a user supported by a resilient, air-filled partial sphere. It contains features which allow users of any size or fitness level to properly exercise muscle groups. The balance board allows a user to exercise upper and lower muscle extremity groups either individually or simultaneously.

Exercise devices can provide multidirectional and dynamic resistance to movement of a user, such that complex movements can be evaluated and assessed. An exercise apparatus includes a shaft, a user engagement structure coupled to the shaft, a position sensor coupled to the shaft configured to detect a position of the shaft, and a processor operatively coupled to the position sensor. The processor is configured to receive position data from the position sensor, calculate position coordinates based on the position data that are representative of a position of the user engagement structure, determine whether the position coordinates are within a previously-defined region, and count a repetition when the position coordinates are within the previously-defined region.