If a person is exercising with an accelerated heart rate (120 beats or more), difficulty breathing, sticky saliva, and dilated muscle capillaries, accelerated blood flow, as well as rhythmic muscle contraction, he or she is engaged in strenuous exercise. For the general healthy population, there are a number of criteria that can be referred to for strenuous exercise, currently oxygen uptake levels, heart rate levels, and rate of change of center of gravity. After using “220-age” to get your maximum heart rate, an exercise center rate of 95% or more is super-intense exercise, and 80% to 95% is high-intensity exercise, both of which can be considered strenuous exercise. Do not immediately squat down to rest after strenuous exercise, should be appropriate to do some small exercise, adjust the rhythm of breathing, wait until the heart rate as well as breathing to return to normal before stopping to rest, and at the same time should drink more boiled water or saline, appropriate amount of replenishment of the body’s water needs.