Bicycles have little effect on losing weight. Mainly to exercise the legs. If you are a girl, you don't want your legs to become muscle legs, and then the bike is not good for your crotch. If you are a man, you don't want your penis to be hurt by the seat bag, do you? Of course, that's only for athletes and crazy enthusiasts who train bicycles all day. Riding a bike properly can exercise your vital capacity and heart. There are many benefits of cycling, but it really doesn't have much effect on losing weight.