For the last year ds has been going to a PT once a week, it is £30 for 1 hour 1-1, or £250 for 10 block of weekly bookings (but flexible if you need to move or postpone). The PT works out of his own gym which he also rents out to one other female PT. To be a client you need to do a 1-1 session at least twice a month.
As well as motivating you and making you feel good about achieving, being a PT client should ideally give you access to other classes/sessions as 1 hr a week isn't enough. ds's PT runs a clients only 1 hour teen cross circuit class for £5 a week which around 8 kids including ds go to. ds also has a clients only gym membership £20/month which he can use as often as he likes Mon-Fri 4pm-6pm (there are ladies circuit training and adult 1-1 sessions after 6pm) and all weekend, he uses it twice a week on Sat/Sun mornings for 45mins at a time with plans the PT has written and keeps up to date with current ability for him.
His PT had an initial session with him and discussed his goals, whether it was strength, fitness, toning he was looking for, discussed his diet, how often he wanted to train, any health issues etc. Then did weights/measurements and a fitness test as a starting point. ds's PT is particularly interested in sports/fitness PT training rather than bulking up and also teens (he used to be a youth footie coach), he also discussed with us not overdoing it at his age as it can have an impact on growth plates etc.
He doesn't give him a diet plan but talks to him about what he is eating and drinking and suggests tweaks (and ds listens to him!). He has an active clients only facebook page which clients share meal ideas on.
A couple of times a year he pushes clients out of the their comfort zones with a sponsored activity and has a couple of nights out a year, ds doesn't go to them all yet as too young but I have taken him to a couple, there are all shapes and sizes there and there is a big team spirit. All money made goes to a local children's mental health charity.
So all in a whopping £140ish a month, but he gets such a lot out of it and it has been worth it. Before he started ds wasn't in a good place, he was the only one of all his friends kicked off his footie team after 8 years of playing together, other teams had folded and his team took in better players. He suddenly had nothing to do while friends were at 3 x weekday training/matches and his confidence was at an all time low). The PT sessions and addons have really lifted his confidence and mood.