We're talking eccentric contraction of muscles so they are both the primary muscle (s) in the initiation and completion of a motion, while ALSO lengthening the muscle in the process. (mindbodygreen.com)
Too often, exercise is done just in a concentric (shortening of the muscle) contraction with little to no thought of lengthening the muscle while in a contracted state (eccentric contraction property). (varietytrainer.com)
Rather, you will be directed by way of various stretches and poses to simply help lengthen muscle tissue and tendons and concentrate on the head and body link. (thelingeriediet.com)