I have a step-son in his middle forties who is a CPT and has made a very good career of it. It was a time-consuming and rigorous program. Initially he loaded a van w. equipment and went to people’s homes (in SF). He worked w. them in the van..Now that he has moved back to Philly, where the weather is less predictable, he has on occasion, set up his own gym and sublet space from another owner. If you would like contact info for him, send me a private comment.