I love this app, I goto multiple different gyms and it helps find a gym and a class, always has been accurate so far.
Now if you want to track your workout then this app is 1 star, I use jefit
If you want to log in without your tag them you are again out of luck.
But if you just want to find the closes clubs and see class times then the app is amazing, which is what I use it for.
Murius about GoodLife Fitness, v2.1