Spin class rocks! Its a room full of stationary bikes that are modified, your actually spinning a weight, if I rember correctly its a 45lb weight. Once you get it going, its not easy to stop! Anyway, its lead by an instructor who takes you on a serious one hour ride, up hils down hils, on sprints, around tingt turns over rocks and through mud... all kinds of crazy stuff. Its torture on your body! And a serious workout! Its all done through the tension you put on the weight. and if your slacking the instructor will come around and crank up your restance for you!
its hard core! Like boot camp! Your upper body even gets worked when your ducking the branches overhead... lol You need a good imagination! lol And you spend alot of time riding while your but is not touching the seat! Talkabout working those quads! ugh!
Thats spin! Its hell! And its $3.00 per class on top of my membership!
But its a burn of 600 to 1000 calories depending on how hard you work!