Warm up exercises - one to avoid?!

Interesting article from the boys over in Eastern Europe, one sure to cause much debate on the forums worldwide; I agree with the article coming from a sport science background, I've never liked this exercise, you see many beginners just flailing their legs around in the air, hardly good for the knee joint.

I'd like to hear your opinions on this exercise, so drop me a message and let me know if it's an aye or nay........

http://www.bjjee.com/articles/most-common-bjj-warmup-a-huge-risk-for-knee-injury/