I highly recommend TMFIT

I started training at TMFIT about three years ago and they have turned me from someone who hated gyms and found group training sessions hideous, to someone who absolutely loves it!! I’m fitter than I’ve ever been in my life and I’m the happiest I’ve ever been with my body, all thanks to their HIIT classes.
The classes are small enough that you are supported and pushed and every single trainer is really friendly and helps you achieve your goals.
If you’re looking for a friendly group to train hard and get fit with in an environment where you don’t feel like second best if you’re not the fittest of the fit then I highly recommend TMFIT.