How much do personal trainers’ charge on average per session to their clients?

I have seen anywhere between $30/hr. and $100/hr. Like everyone has said, it depends somewhat on your market, but also on who your ideal client is and what they will be able/willing to pay for the value you are creating for them. I basically charge $45/hr for gym clients and $55/hr for in-home and offer packages with slight discounts.