1 It is important to be physically fit. If you are, your body is healthy and works the best it can. Many systems in your body must work together in order to do this.
2 You control your skeletal muscles. When you need to use one, your brain sends messages to make the muscle contract. Then the muscle can pull on the bone so it can move, too.
3 Your muscles become stronger the more you use them. Resistance exercises are the most effective to develop the size and strength of your skeletal muscles. Repeated exercise causes the muscle itself to grow both in diameter and strength. Push-ups and curl-ups are examples of resistance exercise. They are tough to do, but are really helpful. They force muscles to overcome the weight of something.
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