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The 5 Best Arm Machines Here are the five best arm machines you can use to take advantage of your gym's equipment selection, mix up your workouts, and build bigger muscles in your upper arms. 1. Fuel Pureformance Dip Station: 2. Marcy Wrist and Forearm Developer: 3. Lifeline Multi-Use Shoulder Pulley Deluxe: 4. Core Prodigy Python Power Twister Bar: 5. Fat Gripz Pro:
