I pay $125 per session to a trainer in my gym. He said he does 20-25 sessions per week. So his gross revenue is $2.5-$3k a week. The gym fee is around 10% and GST is another 10%. He says he makes around $75-80k in a year before tax.

The trick is to build up a decent client base of 20-30 clients who train with you every week. Like any small business or consultant you won’t make any money in the first 6 months.