All those personal trainers I see don't look that rich to me
well, most personal trainers get into personal training because they can't 'hack it' in a regular job... they got into training to get away from having to sell or having to deal with numbers.
a smart trainer will own his own training business.. having other trainers work for him training clients. (client Joe pays XYZ-Training Inc $60/hour for training... trainer Tony trains client Joe... XYZ-Training Inc. pays trainer Tony $20/hour... XYZ-Training Inc. net's $40; Now multiply that by 4 trainers, averaging 4.5hours training per day, 6 days a week.... you get the idea)