Discover how to quickly develop larger arms with the workout provided below. This routine was created by Ryan Humiston, whose YouTube channel has rapidly gained popularity, boasting over 1.2 million subscribers and 85 million views. Known for his direct approach to fitness and unique humor, Humiston recently shared a video outlining how to build bigger arms using just a pair of dumbbells. Sets and reps are specified, with an emphasis on aiming for 15-20 reps in most exercises. Give it a try today!