To tone up the undersides of your arms (good-bye, wiggle), use this routine created by Alden Mills, a former Navy SEAL and a personal trainer in Mill Valley, California. Each move sculpts your triceps and the surrounding muscles. Aim for 12 to 15 repetitions of each exercise and three sets.
Standing at arm’s length from a wall, extend your arms so your hands are flat on the wall at shoulder height, with your thumbs touching each other. Inhale and, in one movement, press your body toward the wall as if doing a push-up. Exhale and push back to the original position, keeping your elbows close to your sides throughout.
Sit on the edge of a chair or a bench with your knees bent and your hands on the bench, positioned wider than your hips. Lift your rear up and shift it toward your feet. Bend your arms to lower your body slowly, then lift back up, keeping your elbows as narrow as possible. For more of a challenge, straighten your legs out in front of you.
Hold a light weight (about five pounds) in each hand, with palms up and arms at your sides, then slowly raise the weights to your shoulders for a biceps curl. When your hands are at your shoulders, contract your triceps, then rotate your wrists, so your palms face out, away from you, and slowly press the weights down. Once your arms are straight, slightly lift them up, behind and away from you, and squeeze your triceps again to finish the move.