The cycling industry — and especially Specialized — is fond of telling us that aero is everything. But it’s not all marketing mumbo jumbo. It’s a proven fact that air resistance accounts for much of the drag you feel on a bike. But while the latest and greatest aero gear can certainly help, it is you the rider who accounts for the biggest impediment to speed. So how big a difference can body position make in aerodynamic efficiency? Check out this video from our friends at the Global Cycling Network to get some answers.