chin-up

Etymology
Not a deverbal, unlike ; the chin-up and the muscle-up as variations of pulling oneself upward were named later than the pull-up, with influence from its name.

Noun

 * 1)   An exercise done for strengthening the arms and back, in which one lifts one's own weight while hanging from a bar. It can be defined more restrictively on criteria like the arms starting at lock-out, or the chin requiring contact with the bottom of the bar, or touching the neck to the bar. Palms may be facing in any direction.
 * 2) * 1973 Marilyn M. Hinson, Kinesiology, page 63
 * Compare the actions of the humerus during the performance of a chin-up with supinated grip with those during the performance of a chin-up with pronated grip. Are the chin-ups alike or different with respect to muscle involvement?