I have been a member of a gym for ages, and going reasonably regularly. I wouldn't say I am particularly fit, but I'm not really unfit either.
I get nervous about going to classes for the first time on my own anyway, but I am so nervous about it, I asked if it was for all abilities and it is, but I hope I don't completely embarass myself by looking really unfit or something.
I am going to make myself go, but already feel nervous and it's not till next week! Please feel free to tell me to get a grip!