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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.
This suggests that you don't have to starve yourself after exercise to still reap some of the important health benefits. Enhanced insulin sensitivity means that it is easier for your body to take up sugar from your bloodstream into tissues like muscles, where it can be stored or used as fuel.