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Weight training pushes your muscles to grow bigger and stronger the more you work them out.

contract or relax according to the orders they receive from the brain. This contracting (getting shorter) and expanding (getting longer) is what makes your muscles pull your bones, making your body move. Weight training results in improved strength and muscle bulk for several different reasons. First, the myofibrils respond to the weight training by growing thicker and stronger. Second, the actual number of myofibrils increases, expanding the size and power of the muscle. Finally, weight training improves the communication between the brain and the muscles.

Lifting Weights, Building Strength

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