Aging Muscle Needs Aging muscles lose mass and flexibility without use. But they respond remarkably well to consistent work at any age. Mobility exercises that move muscles through full ranges maintain both flexibility and function. The muscles you use are the muscles you keep. Muscle-Maintaining Mobility Hip Muscles Hip mobility work maintains the muscles that enable walking and daily movement: JME 108: JME 113: JME 115: Full hip range maintains hip muscle health. Back and Core Muscles Spine mobility maintains the muscles supporting posture: JME 151: JME 152: Spinal movement keeps supporting muscles active. Shoulder Muscles Full shoulder range maintains rotator cuff and shoulder muscle health: JME 53: JME 56: Leg Muscles JME 134: JME 175: Start your 14-day free trial for muscle-maintaining programming. Use It or Lose It Muscles respond to use at any age. Consistent mobility work maintains the muscle function that keeps you capable. Try simplmobility free for 14 days and maintain your muscles.