Muscles are meant to be used. When muscles are not used they can atrophy, or become weak and non functional. Those that are physically handicap often have difficulty maintaining the mobility necessary for sustaining muscle. Because of this they are susceptible to muscular atrophy. Being physically active is very important for both maintaining muscle that they already have and also to build new muscle. Also, things like therapy and exercise can help with range of motion which increases the types of tasks the physically handicapped can perform.
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Bodily movement that is voluntary and goal oriented consider the most important characteristics of physical activity.
Activity is important in preventing osteoporosis
Water
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vitamine E
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or else you will fall and get hurt
Physical activity is important to maintain a healthy body and prevent medical issues later in people's lives.
Regular physical activity
VO2max. This is one important factor (regarding lung function) which determines the total capacity for physical activity, along with muscle conditioning, nutritional factors and others.