Fitness is not a simple exercise, but a systematic science, involving not only physical education, but also comprehensive disciplines in many fields such as health, medical care, diet, physics and biology. Since it is a science, it needs professional academic research, and sports are at risk of injury. There are specialized and professional personal fitness instructors to help you solve this series of problems.

No matter what your purpose is, even if you try for a short time, as long as you use professional equipment (including dumbbells), you need professional guidance from the beginning. The standard of action is not only directly related to the result of training, but also easy to get hurt if you practice the wrong part. Even simple running, the wrong posture hurts the knee quickly, and there are many sudden deaths every year. Swimming is slow and laborious without a coach. Moreover, modern people sit too much in the office, and they all have posture problems, which most people don't perceive themselves. The first step is to correct their posture. To put it simply: people who have no sports experience enter the gym and try to hire a personal fitness instructor. Of course, if you just sweat freely on the treadmill, mountaineering machine and elliptical machine and learn how to use it, you can hire a coach without spending money. If you want to lose weight efficiently, or become a strong man, or become a goddess with obvious lines, a coach is almost necessary for inexperienced people.