Pay attention to warm-up and stretching. Many people go to the gym and can't wait to start running on the treadmill or doing barbell training without any warm-up. When they finished training, they didn't stretch, so they just took a shower and went home. If you do this, you need to pay attention. You are doing an incomplete and comprehensive training. If you insist on doing this, you may be accompanied by long-term injury. The purpose of warm-up and stretching is. Improve your stretchability and elasticity, and prepare for the next training. Warm-up and stretching are very important parts of fitness training. It can even be said that without warm-up and stretching, you can't start training at all, and warm-up and stretching account for at least 20 or more of your total training time.