Biking has been define as a good way of practicing aerobic sport. This type of exercise allows burning calories and avoids what the WHO has defined as the pandemic of the XXI century: Obesity. This disease provokes a lot of cardiovascular problems, among others. Its mechanism is simple, if you eat more calories than you burn, you gain weight. Conversely, if you burn more calories than you eat, you lose weight. The fact of riding helps you to lose weight as well as to enjoy the environment and relax yourself. It also avoids injuries which can be produced in other aerobic sports like running. So it makes up for the sedentary life we live, the TV, seated or playing video games hours we spend.