Muscle building requires a lot of anaerobic exercise. After the warm-up, you can choose any equipment and do it in three heavyweight classes. The maximum weight can be increased to the limit weight that the body can bear, and can be done in several groups. A group doesn't need much, but it's really not good. Protein should be supplemented in diet and beef should be eaten. You don't need a personal trainer. Generally, gyms have travel coaches. If you don't understand, you can ask them to avoid sports injuries, or you can ask the idle coach.