I STARTED TAKING TAI CHI,CHEN STYLE/ SILK REELING QI GONG AFTER KNEE REPLACEMENT . READING OTHER THREAD OF MARTIAL ARTS I FIND IT HARD TO BELIEVE ANYONE WHO HAS SUCH SURGERY WOULD FOLLOW A HARD STYLE.I MESSED UP BOTH KNEES REQUIRING REPLACEMENT AND THERE IS NO WAY.... TO MY QUESTION ,IF ANYONE COULD DIRECT ME , ARE THERE DIFFERENT STYLES OF CHEN STYLE TAI CHI? GOING YOU TUBE I LOOK FOR CHEN SHORT FORM AND THERE SEEM TO BE A MULTIPLE VARIETY OFF " SHORT FORM" CALLED CHEN. 8,16,24 THEY ALL SEEM DIFFERENT.. HAVE FOUND AN INSTRUCTOR BUT HAVE NOT ASKED HER YET