Gabe Mirkin, M.D.
If you have a hard time walking up stairs, or getting out of a chair without using your hands, your thighs are weak and you can strengthen them by pedaling stationary bicycle.
You become weak because you do not use your muscles, not because you age. You use your thigh muscles raise you up stairs, and you strengthen these muscles by pedaling, skating, and skiing, not by walking or running. If you wobble, stumble or walk with your feet wide apart, you probably have weak thigh muscles and can strengthen them on a stationary bike. Pedal every other day until your legs feel heavy or hurt or you feel tired. Then stop. You should be able to gradually work up to the point where you can ride for thirty minutes, three times a week. Then walking up stairs and raising yourself out of a chair should be as easy as pedaling a bike.