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1 Insulin sensitivity is increased, so your cells are better able to use any available insulin to take up glucose during and after activity. 2  When your muscles contract during activity, it stimulates another mechanism that is completely separate of insulin.
Physical activity is any bodily movement produced by skeletal muscles; such movement results in an expenditure of energy. Physical activity is a critical component of energy balance, a term used to describe how weight, diet, and physical activity influence health, including cancer risk.esearchers have established that regular physical activity can improve health by: 1  Helping to control weight. 2  Maintaining healthy bones, muscles, and joints. 3  Reducing the risk of developing high blood pressure and diabetes. 4  Promoting psychological well-being.