Abstract: Exercise apparatus comprises(a) elongated, flexible, and yieldably stretchable elastomeric tubing,(b) first and second connections respectively attached to opposite end sections of said tubing, one of said connections connectible to a restraint,(c) and a harness attached to the second connection, the harness being flexible for releasable attachment to a portion of the human body,(d) whereby said body portion may be displaced in selected modes against resistance imposed by yieldable stretching of said tubing to controllably tension muscles associated with said body portion.