At 13, He Lost His Arm. Now He’s a Top Peloton Coach. Logan Aldridge turned adversity into strength. ... Trainers Swear by This ‘100’ Workout for Sleeve-Stretching Muscle Gains.

3. Arm Swings. Stand with arms outstretched forward, parallel to the floor with palms facing down. As you step forward, swing your arms in unison to the right so your left arm is in front of your ...