Hello my friends. Here's a chin up variation that can really help you grow your biceps!
If your goal is to build stronger arms, then a good strategy is to do biceps chin ups. It's okay to lower yourself down to the ground, reset at the bottom, and then perform each subsequent rep in that fashion. This creates consistency from rep to rep and makes every rep a "first" rep, so that you're not skipping out on training the bottom portion of the exercise.
Have a wonderful day!