Range-of-motion exercises are often helpful for seniors suffering from conditions such as arthritis or other forms of joint and muscle pain. Seniors may be limited in their performance of certain activities of daily living because of pain, and range-of-motion exercises may help to alleviate certain conditions. There are various range-of-motion exercises that may help, depending on the origin of your symptoms. An easy seated exercise that you can perform to increase your range of motion in your legs is the leg extension. Sit in a chair with your hands by your sides and your feet flat on the floor. Slowly extend one leg out in front of you, hold for a few seconds, then repeat on the opposite leg.