The integumentary system, the skin, protects the internal organs from harmful bacteria, sunlight, and injury. The skin is the largest organ of the body and consists of two layers: the epidermis and the dermis. The epidermis is the outer layer. It is made up of dead cells and new cells which make the body waterproof, give color to the skin, and help maintain the body's hydration levels.
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<span>It increases the amount of time spent on fitness activities.
It is often more convenient to participate in lifestyle fitness activities than more formal fitness activities.
It helps a personal fitness program lead to lifestyle change.</span>
