chin upI prefer to have trainees perform chin ups (supinated grip) to pull ups (pronated grip) since this puts the biceps in a stronger position making the upper arm less of a “weak link” in the exercise.
The grip is roughly shoulder width – too much closer or wider and you start to lose some range of motion – and the torso is angled back so the arms are about 20 to 30 degrees off the body in the starting position.
For more information checkout Drew Baye’s article by clicking here