[geon]

Exercise is great and all, but diet is faaaaaar more important for weight loss.

[mistermann]

Indeed, this chart shows caloric burn for various activities, the body is very efficient:

http://www.thehealthyeatingguide.com/calorie-burning-chart/

[JoeAltmaier]

It entirely depends on your effort level. To say 'biking' burns 530 calories per hour seems precise. But a racer can burn 5000 calories. And you can burn everywhere in between those numbers, depending on your exertion level and the course.

[mistermann]

Agreed - however, cutting caloric intake requires far less effort, and doing so via certain diets is far easier than others.

[JoeAltmaier]

Apparently not, considering the vast industry around gaming just that activity.