I have never been able to lose weight just with spinning. I think a lot of this is genetic. I can be away from the gym for 6 mos. then go in and within 2 wks. max the machines for certain exercises. Things like doing leg presses with the full 400 lbs or quad extensions with 200 lbs. But, endurance type stuff comes much, much slower to me. Not surprisingly I was a sprinter in HS but couldn't run distance worth a damn. My basic problem has everything to do with calories in and calories out as has been stated here before.