Practical held only to the initiates, it consists in going down from the beforehand traced tracks, at the very high speeds (40km/h until 90km/h), strewn with baffles, jumps, stones, and ruts.
The whole in uneven largest possible, all things considered: "that happiness".
This discipline, like the free-wrinkle, is not to take with light, it this practice with good numbers of equipment, such as knuckles, full-face helmet a dorsal, one avoids stone...
Moreover, the bicycle is him also specific, heavy to the maximum more 18kg.
In this discipline, the rise does not have its place. Indeed, to in no case the rise can be practised with such machines; that not meaning that the physical condition is not setting, because the descent requires doigtée and precision (functions obtained that with good conditions physics) throughout course.
The closest practices with the descent are the furnace-cross-country race and it free-wrinkle.