OLD-STYLE ROUNDHOUSE KICK: Ready stance (1), chamber (2) and horizontal delivery (3).

MODERN ROUNDHOUSE KICK: Ready stance (1), chamber (2) and upward-angled delivery (3).

Hee-Il Cho (right) prepares to execute the twist kick (1). He chambers his right leg (2-3), then shoots the ball of his foot into his opponent’s chest (4-5).

Hee-Il Cho faces his opponent (1). He lifts his left foot and begins spinning counterclockwise (2-3). At just the right moment, he jumps (4) and extends his leg into the abdomen of Jacob Cho (5).