Or 'Spin'
I was told that the hand grips on the bikes at our differ from the original 'Spin' class. Different grips or not, it is an intensive workout where you will burn calories whether you are naturally slim or considered 'obese'. I tried this class when I weighed around 13st and I couldn't stand up on the bike to do the hill rides but I carried on cycling for the full 40 mins. That first class had definitely got me hooked but alas I didn't go back until Nov 2011.