In ten years, that amounts to five pounds of lost lean muscle tissue. Since lean muscle tissue has the greatest ability to burn calories, loss of this tissue inevitably results in excess fat and weight gain. Building muscle decreases the risk of developing fat-dependent diseases such as heart disease, diabetes and cancer. Muscles that have grown weak and stiff from disuse leave the body more prone to injuries. In women, in particular, muscle strength adds density to the bones, reducing the incidence of osteoporosis and broken bones from falls.
Strong muscles support the spine, therefore when muscles become stronger our posture improves.
Protruding abdominal muscles can cause swayback, lower back weakness and pain. Weak upper back muscles create a sunken chest and the dowager hump of old age. A strength-training program enables our bodies to recover their natural beauty and definition. Over time the muscles continue to strengthen, even for those who begin training in their eighties. Aches and pains dissipate as we stand taller and straighter and become more balanced in our bodies.