In this video tutorial, viewers learn how to do a 21's workout for biceps. Users will need to use a barbell for this exercise. Users will be doing 21 repetitions of barbell curls. The first 7 reps is just the bottom part of the movement. Then the second 7 reps are the top part of the movement. The last 7 reps are the full movement of a bicep burl. This video also provides a demonstration for viewers to easily follow along. This video will benefit those viewers who are interested in health and fitness, and would like to learn a bicep exercise that will help build muscle fast.