Bicycles can't lose fat locally. Partial fat reduction is impractical (almost impossible). Fat is evenly distributed throughout the body. Riding is the best way to reduce fat. During the period of reducing fat, your intake will not be greater than your consumption. How can you gain muscle? Moreover, women don't gain much muscle. Women practicing for 30 days is equivalent to men practicing 1 day, because they don't secrete long muscle hormones at all. Moreover, the weight of the bicycle is not enough, and long muscles need a lot of weight stimulation.