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I did a few spinning classes a couple of years ago, when I was monster fit. The final one - 90 minutes - nearly killed me.

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90 minutes ? christus! I'm dead after 40
Spinning is great for weight loss and keeping your cardio vascular fitness up when you can't go out for a hack regularly .ie too wet/dark /late etc

Spinning or programmed cycling (Technogym) gives you more disciple in terms of intensity of effort as its easy to freewheel out on the bike. Try freewheeling on a spinning bike