Sit on the edge of a sturdy chair with your back straight, feet on the floor, arms at your sides. Hold a 5- to 8-pound weight in each hand, palms facing your body. Bend your elbows so your arms form a 90-degree angle.
Then, keeping your elbows bent, lift the weights to shoulder height. Lower your arms to your sides, then straighten to return to starting position. Repeat for reps.