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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.
Very simply put, insulin sensitivity (or âcarb toleranceâ in everyday language) is a healthy hormonal state that allows your body to digest and store carbohydrates without a problem. In healthy people, hereâs how it works: You eat something with carbs (letâs say a potato, but it could be anything).