Remember to consult your doctor before you start any exercise program and to stop exercising if you feel light-headed or become short of breath.
Stretches: Sit on the edge of your couch, with one leg extended in front of you, heel on the ground and toes pointing upwards. Slowly bend at the waist and reach toward your toes. It's okay if you feel a little discomfort -- but stop if it feels painful.
Light cardio: You can easily march or jog in place in front of the TV. Try it also while sitting down -- just march your feet in place.
Weights: If you don't have weights at home, food cans or anything else heavy will work. Hold your arms above your head, and then bend your elbows so the weights are lowered toward your shoulders. Then repeat. Alternatively, use the weights to perform bicep curls.
Jumping jacks: You can perform these while sitting down, stretching out your legs and arms fully on each movement. Keep your abdominal muscles tight. If you are feeling more active, perform regular jumping jacks standing up.
Stability ball: Instead of sitting on the couch to watch TV, try using a stability ball. Use the ball to keep yourself warmed up while you're not exercising.
Commercial breaks: Use the time during commercial breaks to do your more vigorous exercises or
exercises that don't allow you to keep an eye on the screen.