I just saw this on Blackbeltmag.com:
Surprisingly, this 6-foot-2-inch heavyweight moves and kicks as rapidly as a bantamweight. After all, his heavily muscled frame looks more like a linebacker’s than a kicker’s. However, watch him begin to demonstrate the karate moves on his 2-DVD set, Full-Contact Karate: Advanced Sparring Techniques and Hard-Core Physical Conditioning, and you’ll see how this giant moves nimbly and precisely.
Here’s Mr. Yamaki at work:
Man he’s got some fast kicks! Also note how his opponent starts to slow down from the continued beating while Kenji seems to pick up speed. And check out that nifty leg-check move near the end–cool stuff!