Coaches in league classes generally charge by class hours. One class is between 80- 150. How much you earn in an hour depends on how many classes you have in a month. Learning a personal fitness instructor is generally through going to a fitness instructor training institution to participate in the study and obtain a fitness instructor certificate. A fitness instructor must have a fitness instructor qualification certificate. If you want to be a fitness instructor, you must have a fitness instructor qualification certificate. To obtain the qualification certificate of fitness instructor, you need to undergo professional fitness knowledge and skills training, and then conduct assessment. You can get the national fitness instructor certificate, which is a certificate with high recognition in the gym at present.