Are bicycles good for losing weight?

No. I would recommend a tredmill its more intense for losing weight while your on a bike you're sitting down and not burning as much calories Any method that you're able to stick to and can get your heart rate elevated is a good method for losing weight, you can dawdle on a treadmill as well as on a bike. RIding hard can use up 800 calories/hour which is pretty darn good exercise any way you look at it.

Bikes are good because they offer a low impact method of exercising, which can be important if you're significantly overweight.

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