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The reason for this is the following：

1. can increase muscle.

The space with reduced subcutaneous fat can be partially filled with enlarged muscles. Long-term fitness, due to the bio-economic principle (the body will not be wasted), the skin will adapt to gradual renewal (at least in a few years, which is why you who are eager to lose weight should be patient)

2. It can increase the secretion of HGH.

HGH is a gift from God to soldiers and hunters. Let's go back to the principles of bioeconomics. If your body doesn't think it is necessary (such as a sedentary lifestyle) to secrete so much HGH, why should it? HGH is secreted by hypothalamus. Some strenuous exercise, such as HIIT training, will tell the body that it is in a state of emergency and needs a lot of HGH to repair sports injuries, so that the body will secrete more HGH during the recovery period after exercise (during deep sleep). Protein in food is digested into amino acids, which promotes the synthesis of skin collagen with the help of HGH.

3. It can increase the body's ability to scavenge free radicals.

Although exercise itself will produce a lot of free radicals, exercise will increase the body's ability to scavenge free radicals.

4. Increase blood supply and speed up renewal.

Exercise increases the blood supply to the skin, and the most common sensations are redness, fever and sweating. These will accelerate cell renewal.