In the name of generating power, hip rotation is highly emphasized in Shotokan karate. The truth is, there are many ways to increase impact into a target. With the obsession on hip rotation, other opportunities for power generation are often neglected by Shotokan practitioners. In this video I use the standard reverse punch (gyaku zuki) as an example of how what is perceived as "good form" can sometimes come at the cost of potential power loss.
Side note: This video was picked up by a couple of Karate Facebook pages and generated a lot of discussion/debate/emotion. Some insisted that I was confusing kihon and kumite and missed the point entirely. IMO, kihon needs to be functional. I think Shotokan kihon is far too formal and because of this has lmitations. Note that in the video I am not suggesting that hip rotation is a bad thing. It's just not the only thing.
Hope you enjoy the video.