In honor of this year's Go Skateboarding Day, Gatorade and Zoo York pro Chaz Ortiz wants you to learn how to backside smith grind a rail. Figure that out, and he'll show you how to move up to a ledge, too. / networka Subscribe to Network A! http://www.youtube.com/subscription_c... Like us on Facebook: / networka Follow us on Twitter: / networka Follow us on Tumblr: / networka