The benefit of stretching is that leg pain can be improved, the side effect is that there is a certain degree of danger 1. The benefits of stretching: stretching for back pain, leg pain have a very good effect, in the process of stretching, you can dredge the meridians, for the elderly, often stretching can improve the phenomenon of back and leg pain, stretching training can also enhance the muscle stretch, so that the joints are more flexible, so that the body is more flexible. 2. Side effects of stretching: stretching has a certain degree of danger, without stretching the crowd is not recommended to stretch on their own, easy to get hurt, it is best to find an experienced person to take with them to do, forcible stretching, too much force will lead to muscle strains or damage, and then do not do the training of stretching in a hurry, or it will be counterproductive.