Muscle soreness after muscle training is caused by overtraining. As far as the initial trainer is concerned, the next day after training, he will obviously feel the pain in the training area. This kind of pain is called "delayed muscle soreness" and will disappear after about five days. He will have a rest the next day and exercise moderately on the third or fourth day.
As far as muscle building training is concerned, the effect of training lies in pumping feeling and exhaustion training in the training process. During the training process, lactic acid retention and muscle soreness in the corresponding parts caused by weight-bearing training will disappear after 5 hours of muscle building training; But rest the next day, or arrange training in other parts according to the training plan, instead of repeating the training parts of the previous day.
Normal muscle building training requires 72 hours of repair for large muscle group training and 48 hours for small muscle group training. Even abdominal muscle training should rest and adjust in time. Fitness training is for health first. Fatigue or overtraining is not only bad for training effect, but also leads to training injury.