左手上側がクラッチで、下側がリアブレーキですね。
練習風景は意外と見る機会が少ないので、貴重な映像かもしれません。
StuntBums spent some time with Nick Apex, Icon rider and one of the most skilled figures in our sport, to explore the daily work of a professional rider. What you can't tell from the video is that it's 116 degrees outside - that's one hellish day at the office.
Nick Apex Training For XDL Exhibition at X-Games 16
http://www.youtube.com/watch?v=b5_mhaRZUDw
XDL Exhibition At X-Games 16 Highlights
http://www.youtube.com/watch?v=ZoMSS8FRoi8