Active workout motion imparted to a portion by voluntary contraction and relaxation of its controlling muscles. In the Fitness and Arthritis in Seniors Trial (Fast), researchers evaluated the effects of physical activity in much more than 400 older adults diagnosed with osteoarthritis. The working out seniors not only suffered significantly less arthritis pain, they showed significant improvements in mobility and strength. Regular physical exercise can enhance power levels and significantly improve muscle strength, endurance and flexibility.