High-intensity interval training is one of the best ways to pack a lot of exercise into a short period of time. HIIT workouts are so efficient because they alternate short bursts of very intense ...
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What Is the HIIT Exercise Program?
HIIT workouts cause a short-term spike in cortisol (a hormone that is part of the “fight or flight” response), which makes the body grow stronger. However, maintaining high levels of cortisol over the ...
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