Medically speaking, compensation means that some organs of the body are damaged by diseases. In order to achieve the balance in the body, the body will independently replace or compensate the metabolism and function of the damaged parts and related organs, tissues and cells. Compensation is good for health, but it is not without side effects. It can't be said to be beneficial in fitness. For example, an action may be done, but it is only a form. After a while, you will feel backache and leg pain. Like this, the core strength is too weak, and the body will mobilize the strength of the waist to complete an action. This is compensation, but you can't achieve the effect of exercising the core at all. It's useless.