the gym is small to be honest, but it is only about £50 a year. Theres a few of the normal machines really, a pool, sauna, and the sports hall used for clubs and some fitness classes. Theres a gym owned by edin burgh leisure in drum brae, 10-15 minute walk i think, and that will probably be much bigger, and do all the different classes.
The gym at uni does do some fitness classes like dance, circuits, abs, pilates and aqua fit type classes.