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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.
Excessive insulin in the blood reduces your sensitivity to insulin and can cause diabetes, which is also linked to overweight and obesity. Exercise improves insulin sensitivity and reduces the reliance on insulin injections. Moreover, the effects of exercise on the endocrine system are also psychological.