Mr.Olympus

I am an instructor and been practicing martial arts for 30 years Okinawan Goju Ryu, and a history of Kung-fu. Yes there are several arts that practice internal strength training or Chi-Kung. The first karate art to practice such was Goju Ryu, also known as Naha-te with Sanchin for hardening the body and Tensho for the equivolent of Tai chi. The sister art of Goju Ryu Uchi Ryu also practices this form of martial arts.