It's easy to focus on biceps and triceps exercises during my upper-body workout. Sometimes I even throw in some back moves. But my go-to arm routine was missing a major muscle group: rear deltoids.

Trainer: I'm Begging Guys to Try These 5 Exercises for Delt Gains originally appeared on Men's Fitness. Broad shoulders aren’t built by accident, nor are they developed quickly. If you want capped ...