Dae Kyu Chang, Sa Bom Nim USA TAC explains exercises to improve control of toes, ankles, and hips for stronger Front Snap Kick Ahp Cha Nut Gi technique
Moo Duk Kwan Kwan® Jang Nim H.C. Hwang shares insights about proper execution of the Front Stretch Kick (Ahp Podo Ol Rigi And Front Snap Kick (Ahp Cha Nut Gi)
Demo at K of C in Brooklyn, NY 1969-70. I was 5 feet 11 inches at the time, so I know the height was over 6 feet for the board break, it took me three attempts to make it.