I've been spinning for about six weeks and it's the best decision I've made in a long time. Yes, as someone above said, some people appear to be working but aren't. So what! The class is about challenging yourself. When I did my first class I couldn't stand on the pedals for more than 30 seconds without my thighs screaming. I've always been a masher so this was a challenge. It took a while but now standing is no problem. I love the music, enjoy the comradery and find that the group class keeps me working when I know that if I were home I'd stop. If you have the willpower to train at home, fine. I've identified my limitations, dealt with them and I can't wait for better weather.