Everything about the band stays the same. Pass it over the bar and back through itself, pull it snug, step in from a box and set it under the middle of one foot. Only your hands change, which makes it a band assisted chin-up, and the training works the same way.
Your grip is what changes
- Take the bar palms toward you. Set your hands about shoulder width apart, wrists straight.
- Start from straight arms. Set your shoulders down and back, away from your ears.
- Pull until your chin clears the bar. Drive your elbows down toward your ribs and leave your neck long.
- Lower slowly. Go all the way back to straight arms before the next rep.
The grip shifts the work a little
In a study of twenty five adults, the biceps and chest were more active in a chin-up, and the lower trapezius was more active in a pull-up1. A second study of nineteen strength trained men found activity across the shoulder, arm and forearm stayed similar over a whole rep, whichever way the hands faced2.
Both studies measured muscle activity rather than growth, and both tested lifters without bands. Read them as a small shift in the work and not as a new exercise. The two lifts train much of the same muscle, so choose by your goal and by the grip that suits you.
Give your chin-up its own ladder
Your bands are the same, and so is their order, lightest to heaviest. Your place on that order may not be. So do not carry your pull-up band across. Find it fresh with the same test set: the lightest band that gives you five full reps with good form.
Then keep each lift's record apart. You may end up on a lighter band for one than the other, and that is fine.
The training rules are the ones you already use. Two or three sets of five to eight full reps is the starting point. Move to the next lighter band when every set reaches eight and every set was Clean or Fair. On that day, add no set.
Train the lift you want most
If your goal is a first pull-up, make the band assisted pull-up your main lift. Strength carries over best to the movement you train, a principle known as specificity3. Adding a few chin-up sets is a coach's option rather than a rule, and they count as more hard work for the same muscles, so keep your total sets in check.
If you would rather have a first chin-up, the road is the same. On your lightest band, with clean sets, try one with no band right after your warm-up. Take up to three tries, with all the rest you need.