The Best Dumbbell Arm Exercises For a Stronger Upper Body, ASAP

As a compound exercise, the lawn mower requires multi-joint movement that looks simple, but targets a whole host of muscles, including your back, arms, shoulders, and core.

1. With a dumbbell in your left hand and your right arm bent with the right hand in a fist (about shoulder height), squat, bringing the weight toward the floor.
2. Pull your abs to your spine as you straighten your legs, and pull your left elbow up, bringing the weight to your chest while your right arm extends straight.
3. Contract your right arm, bend your knees and squat, coming back to the starting position. That's one rep.
4. Complete three sets of 10 reps on each side.