Lean forward with one hand on the seat of a chair, supporting your upper body. In the other hand, hold a weight. Keep the palm that is holding the weight facing your body, with the arm hanging toward the floor. Bend your arm, so your hand is about in line with your back. Hold for a second, firming the arm muscles, then lower. After performing between 8 and 12 reps on one side, switch and do the exercise with the other arm.

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