1, which will affect the maximum oxygen carrying capacity.

2. Nicotine in cigarettes will affect the growth rate of muscles and have an impact on fitness.

3. Smoking will affect heart and lung function and make blood vessels thinner. In principle, it is just the opposite of fitness.

4. When you exercise, your lungs do a lot of exercise and your blood circulates faster. Smoking will cause several times more damage to various organs of the body than usual, and it will also subtly affect your fitness effect.

Extended data

(1) To do fitness exercises in winter, warm-up activities should be sufficient, especially outdoors. First, make full preparations for warm-up, and then carry out higher-intensity fitness exercises.

(2) The thickness of clothes should be suitable for winter fitness activities, and the head, back and feet should be kept warm. Pay attention to keep warm when exercising outdoors. Don't stand in windy places after exercise, put on clean clothes.

(3) The environment should be clean and comfortable. When you exercise indoors, you must keep the indoor air circulating and fresh.

Baidu Encyclopedia: Precautions for Fitness