Regular body side is a quantitative index to test your physical function and find out the gap with fitness goals, but now fitness consultants are your body side, and 99% are aimed at personal education. Imagine, if you are better than the coach, do you still need a side? In short, if you are rich and willful, please teach privately, otherwise it is unnecessary. Fitness lies in insisting on exercising in the right way. You can ask your good friends who practice together and find professional books to study.