Try doing this beneficial physical activity to strengthen your shoulder muscles. Do this exercise regulary to stay healthy.
This exercise put your biceps in a stronger line of pull so they will typically hit your biceps a bit harder than pull ups will because of the grip you're using.
1. Start off by hanging on the bar, with your palms facing you (underhand). Keep your legs either in the crossed form, or straight.
2. Now, pull your body up slowly until your chin clears the bar. Then finish by lowering your body until arms and shoulder are fully extended back into a dead hang position.