4. Leg lifts (abdominals)
Sit with good posture toward the edge of the couch or chair. Hold on to the sides and extend your legs straight out. Lean back slightly so that your abs feel contracted and engaged. Bend your knees, bringing them in toward your chest. Repeat this move 10 or more times.
5. Leg extensions (front thighs)
Attach some ankle weights to each ankle. Sit toward the edge of the couch or chair. Hold on to the sides. Bend your knees. Then lift your lower legs up to a straight, locked-knee position. Lower and repeat 10 or more times. Do this move slowly, using about 2 to 3 seconds each to lift and lower your legs.
6. Toe lifts (calves)
Sit with good posture toward the edge of the couch or chair, with your knees bent and your feet flat on the floor. Lift your heels up off the floor as high as you can, up on the balls of your feet. Hold for 2 seconds, then lower. Repeat 10 or more times. You can make this exercise more intense by placing a heavy book across the top of your thighs and lifting and lowering your heels with the book in place.
These exercises will help you burn a few more calories daily, too, while watching your favorite TV shows. But I also want to urge you to get to the gym as a regular habit — that way, you won't let yourself turn into a fully baked couch potato!
Martina Navratilova is AARP's fitness expert.