1. exercise in which opposing muscles contract and there is controlled movement (tension is constant while the lengths of the muscles change); - Example: "the classic isotonic exercise is lifting free weights"
WordNet (r) 3.0 (2006):
isotonic exercise
n 1: exercise in which opposing muscles contract and there is
controlled movement (tension is constant while the lengths
of the muscles change); "the classic isotonic exercise is
lifting free weights"