Question: how many reps chin ups?
Answer: To build prowess in your biceps and back muscles, use chin-ups as part of a workout progression. Once you can pretty readily do 12 to 15 chin-ups, move to multiple sets with 10 reps in each set. For a few weeks, do two sets of 10 chin-up reps. In the next few weeks add a third, fourth and even a fifth set.