Always knew this anecdotally, but see it in print now…
Relation of anterior pelvic tilt during running to clinical and kinematic measures of hip extension
British Journal Sports Medicince 34:279-283[/i]
Conclusions The outcomes of this study indicate that anterior pelvic tilt and hip extension are coordinated movements during running. Static hip extensions flexibility measured using the modified Thomas test does not appear to be reflective of these dynamic movements.