Hi,
There is evidence out there that has shown static stretching to be detrimental for endurance athletes [Jacobs & Berson (1986)]. Increasingly dynamic stretches are being used before exercise which build up slowly towards match specific actions... sumo squats, lunges, and even fireman lifts are part of rugby warm ups.
www.sportsinjurybulletin.com
This is a good website for exercise related information and has some interesting topics.
Hope this helps,
Mark.