We have a warning for you before you embark on this workout. It’s, er, a bit challenging. The good news, though, is that the reason it’s so hard is also the reason it’s so effective. Instead of using a sequence of exercises that target different muscle groups, this workout involves doing pairs of exercises that target the same muscle group. … Continue reading Get Lean With This 20-Minute Dumbbell Circuit & Stimulate Both Muscle Growth