For ordinary young people, one to two hours of exercise every day is the best amount of exercise, and it is better to exercise from 5 pm to 7 pm in a day. After a day of photosynthesis, plants constantly absorb carbon dioxide and release oxygen. During this period, the air quality is relatively good, which is more suitable for shortness of breath during exercise. It is also appropriate for children to exercise for an hour or two every day.

For the elderly, it takes about half an hour to an hour to exercise every day to achieve the effect of exercise.

Extended data:

Precautions after exercise:

1, don't drink a lot of water immediately after exercise.

Because of continuous exercise, the body sweats a lot, leading to the outflow of inorganic salts (mainly sodium) in the body, and the salt content in the blood is relatively low. If you drink a lot of water at this time, the salt content in the blood will drop sharply, and sweating will make the salt more easily lost, thus reducing the osmotic pressure of cells, leading to the imbalance of sodium metabolism and easily leading to muscle cramps.

Don't squat down to rest immediately after exercise.

After exercise, people usually feel tired, so they unconsciously squat down or sit down to have a rest. In fact, this practice is not correct. If you squat and rest immediately after fitness, it will hinder the blood return of lower limbs, affect blood circulation and deepen physical fatigue. Therefore, after each exercise and fitness, you can simply do stretching exercises to gradually relax your body, and then go to rest after breathing gradually becomes stable.

Don't take a bath immediately after exercise.

After exercise and fitness, many people are used to taking a shower immediately to refresh themselves. In fact, this practice is not scientific. Because people's body temperature will rise after exercise, capillaries will expand, and the skin will take away heat through a lot of perspiration. If you take a bath at this time, especially when the water is cold, the sweat glands will suddenly stop sweating and lose heat, which is not conducive to the recovery of physical health, and even cause muscle spasm, reduce immune function, and cause diseases such as colds, colds and tracheitis.

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