Tommy Caldwell V12

Tommy Caldwell uses the knee-bar beta to send this Klem Loskot classic 8a+ (V12) in Rocklands at the Alpha Farms this year. Tommy felt the knee-bar made the problem feel like 7c (V9) with or without the knee-bar, this climb is a total classic.

算是Knee Bar的示範教學吧！
附上攀岩英文名詞大全http://www.spadout.com/wiki/index.php/Climbing_Terminology