. . "isotonic exercise"^^ . . . . "100593082"@en-us . . "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\""@en-us . "100628131"^^ . . "isotonic exercise"@en-us . . . . "00628131-n"^^ . . "0"^^ . "0"^^ .