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The higher the intensity the better, it will release more endorphin's. Genetically we are primed for burst interval training, not slow low intensity prolonged exercise. Low intensity aerobic exercise, does not have the same effect on hormones such as testosterone and growth hormone compared to high intensity sprints, circuit training or weight lifting.
So remember if you are going to exercise..? do some sprints, or a intense body weight circuit, and have rest days.
Think primal.
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