Here’s a good article from NY Times about stretching: (There is also a short video on that page.)
http://www.nytimes.com/2008/11/02/sports/playmagazine/112pewarm.html?em
Illustration by Emily Cooper
STRAIGHT-LEG MARCH (for the hamstrings and gluteus muscles)Kick one leg straight out in front of you, with your toes flexed toward the sky. Reach your opposite arm to the upturned toes. Drop the leg [...]