Get Devastating Kicks! Iron Leg is a traditional method of strengthening and conditioning your legs for maximal power and endurance. These methods are based on a street-practical system used by the Chinese Police and Military called Jing Quan Dao (Way of the Alert Fist). Developed by Grandmaster Alexander Tao, a Guinness Book of World Records holder, Jing Quan Dao is highly effective for combat and self defense.