The median annual wage of fitness trainers and instructors was $31,090 in May 2010. The median wage is the wage at which half the workers in an occupation earned more than that amount and half earned less. The lowest 10 percent earned less than $17,070, and the top 10 percent earned more than $63,400.
Some group fitness instructors and personal fitness trainers work other full-time jobs and teach fitness classes or offer personal training sessions during the week or on the weekend. Fitness trainers and instructors may work nights, weekends, or holidays. Some travel to different gyms or to clients' homes to teach classes or offer personal training sessions.
Source: Bureau of Labor Statistics, U.S. Department of Labor, Occupational Outlook Handbook, 2012-13 Edition