At dusk around five o'clock, the human body's exercise ability reaches its peak, and the senses such as vision and hearing are more sensitive, and the heart rate and blood pressure also rise.

Precautions for sports:

1. Don't exercise while playing with your mobile phone. The interval between each group of movements should not be too long, and the spirit of fitness should also focus on the muscles you exercise. Playing mobile phone will distract attention, and the interval between each group of actions will be long, which will weaken the training effect.

2. The hardest part of fitness is not to challenge the weight that you can't lift, but to ensure that the posture of each group of movements is correct and the relevant muscles are properly trained. If you force it to be heavier, it will not only make you "borrow" to tilt the force to the muscles you don't intend to exercise, but also may hurt you.

3. Muscle is not a machine. Muscle tissue needs time to grow after gravity training. Doing too much will make muscle strain "contract muscle", which is not worth the loss.

4. When exercising the lower body, it can stimulate testosterone, accelerate muscle growth and accelerate metabolism. People who exercise the lower body at the same time will gain muscle faster than those who only exercise the upper body. And if only the upper body is raised, but the feet are like toothpicks, they will not look good when they are young?

5, the back makes a person look stronger and can "support the chest muscles." If you only practice your chest muscles for a long time and don't practice your back muscles, it will cause hunchback over time.