Re:Importance of warm-up (Score 1)

Agreed! I've never heard of stretching to improve your ability. You stretch early so you don't tear later. Being an active practitioner of No-Gi Jiu-Jitsu and Submission Wrestling, I wouldn't roll on the mats AT ALL w/o stretching first. Anyway, it makes sense that you would loose a little performance if you held stretches repetitively for 20-30 seconds. That's not stretching...that's an exercise, 10 seconds is a stretch.