This type of work is bottom of the profession. It is a must for some just to get started. The income is dependent, a smart trainer will be proactive and fill it themselves. If you suck as a trainer, can’t keep clients, don’t sell well, or don’t want to work, then they will starve and get online and realize how bad it sucks to work there. A personal trainer just earn after commission average about $ 23- 25 per hour. 10%- 20% on all supplements sold.