Practice the Lunge stretch or “Samson” Stretch:
(From Lynne Pitt’s FAQs)
To perform the samson stretch you interlace your fingers and raise them overhead so your palms are facing the ceiling, lifting with your shoulders. Your legs are in a lunge position with the rear leg’s knee touching the ground. Stretch your hands up, and stretch/sink into the lunge. For a more detailed explanation (and pictures), check out the April 2003 issue of the CrossFit Journal.