You know the 10,000 hour rule. Apply that to street/trails biking and you get this.

Description: Filmed over the period of a few months in and around Edinburgh by Dave Sowerby, this video of Inspired Bicycles team rider Danny MacAskill features probably the best collection of street/street trials riding ever seen. There’s some huge riding, but also some of the most technically difficult and imaginative lines you will ever see. Without a doubt, this video pushes the envelope of what is perceived as possible on a trials bike.

(via: waxy.org)