This is a classic training action of biceps brachii.

Different parts, completely different movements, it really doesn't matter whether you practice separately or together. As long as your weight, the number of groups, the interval between groups, the number of people in each group are reasonable, and the action standards are in place, it really doesn't matter whether you practice alone or together. It's just that I personally think it's a waste of time to practice separately, that's all ...