if you wanna lose weight, wouldn't a heavy bike be better? I'm a clydes and when I'm not commuting I'm spinning up hills with my 50lbs bike.

Azesty: losing weight has a lot more to do with diet than exercise. cycling for 15 minutes burns anywhere between 200-600 calories. to put it into perspective, 4 oreos have 220cals. and a bag of chips could easily have 600cals. Meaning that it's much easier to watch what you eat than it is to work it off with exercise.