Super-Fast Kata

I had a great class the other day - really fantastic. The decision had clearly been taken at the top to work us all hard and for two hours we did. Two men had to drop out for a rest. It was mostly the usual stuff but for longer. Lots of basics, variations on basics and featured prolonged techniques in horse stance etc. However we did something new to me - kata slow, then kata as fast as you can do it. Not a way to execute perfect technique or display kata correctly, but really hard and fun. Additionally, you really have to know your kata very well to get through it. At the end I was really exhausted. Now I do know that kata is not about going at it really quick - it's all about the opponents and effective techniques - but what a great way to exercise, try it!