I mean if you were overweight?
I approached one last year and he basically told me I was too fat to join and I should work on my nutrition first and lose some weight before I contact him again 
It really knocked my confidence.
I didn't want to join a gym as I have anxiety and I tend to feel lost in situations and if I was to have to sort out my own routine I think I'd just do a runner.
I thought with a group you're being told what to do and so there's no room for feeling lost.
I've lost a little weight.
But am scared to approach another group.
The women attending in the group photos always looks slim anyways!