This depends on the situation, gym and location. Generally speaking, in better-grade gyms, coaches are usually charged by class hours, which is about 150-200 per class, and there is nothing more than this. If you hire a personal trainer at home, the cost will be more expensive. In fact, if you do fitness by yourself, there is no need to hire a coach for the purpose of losing weight. Aerobic exercise is the center, running, skipping, swimming, cycling, etc., and the amount of exercise each time is about 30 minutes to an hour. If the purpose is to build plastic muscle, you can consider finding a personal trainer. However, if you have the method, you can find a personal exercise plan online. After all, people have different physiques, so there is no need for a plan. In this way, practicing by yourself can also be effective. .