Try This Bicep Exercise to Improve Your Pull-ups
If you’re like 99% of people, the top half of your pull-up is your weak point. The pronated bicep curl is a great accessory exercise to strengthen the top portion of the pull-up.
Aim for 3 sets of 10-15 reps. You'll feel it in your forearms which is a good thing!
Your hands should be moving toward your forehead. Pull with your arms, and try to prevent your lats from taking over the movement.