10-Minute CrossFit Workouts to Build Lean Muscle — 13 Workouts All in 1 Place

While barbells and gymnastics moves are a big reason CrossFitters' arms look so strong and defined, dumbbells are just as important. This dumbbell workout incorporates five moves to target the biceps, triceps, chest, shoulders, and upper back.

Equipment needed: pair of dumbbells (six to 20 pounds). You can keep two pairs on hand to switch them up based on the moves.