The answer is definitely not completely listening to the projects they recommend. The level of fitness instructors varies from industry to industry. Some people just exercise independently for a while, or learn from others. After a period of time, they started their own fitness classes and became their own fitness instructors. In fact, they don't have the level of fitness instructors at all.
The fitness instructor will not consider herself completely, but also her income, that is to say, she will increase her income as much as possible, so we should decide which recommendations to choose according to our physical condition and the degree and position of the muscles we want to exercise. Don't take too many courses at once, or you won't have that much time at all.
Everyone should pay attention to protect themselves when exercising. Don't get hurt. It is easy to get hurt when exercising, such as knees, ankles and so on.