Weight training also increases bone-mineral density and, over time, might reverse osteoporosis. And, adding muscle makes weight loss more realistic because muscle burns more calories than fat. Studies show that if you add 5 lb of muscle, you will burn up to 250 more calories daily. Weight training also improves posture, which makes you look and feel younger; it reduces stress; improves self image; and makes it easier for you to do all the things life involves, from carrying groceries or cleaning out a closet to playing golf or going dancing.
Effective weight training challenges muscles to a point where some muscle tissue breaks down. Then, during recovery, your body repairs and grows the muscle cells, producing a gain in the total amount of muscle tissue. The recovery time is about 48 hours, so you should schedule strength-training sessions every other day, never on consecutive days. Aim for three workouts each week. Do exercises that work compound muscles and joints.