The personal trainer I use works at the gym I go to, so we have our sessions there.
The cost is £105 for three hour sessions, £175 for 10 half hour sessions, or £300 for 10 full hour sessions.
I have an arrangement with the trainer to get 12 sessions for £300, so that's £25 per hour, which is not cheap.
I've got 8 sessions left, and I intend to use them over the next four weeks, after which I will be taking a break from PT sessions (they've cost me £600 so far!), but I hope the work I've done in these sessions and the things I've learned will prove to be worth the money.
At the very least, it's motivated me to get off my backside and work!