Cycling is one of the main means of transport in many parts of the world. Its practice, cycling , constitutes both daily use, a popular leisure and a sport .
In cities, you drive an average of 15km/h. Adults move about 16 to 30 km/h on the flat on a bicycle. On a fast racing bike, a trained cyclist can reach about 70 km/h on a level road for short periods (sprints). Compared to walking, the bike is two to three times more energy efficient and between two and four times faster. It has also been calculated that in terms of energy conversion from food, it is a more efficient form of locomotion than any biological organism.