An Ollie is basically an upward/forward jumping trick. The name “ollie” comes from the nickname of Alan Gelfand who created the ollie in 1976. The ollie was then modified for flat-ground use by Rodney Mullen in 1982, and it is this flat-ground version of the ollie which is most commonly referred to as the ‘ollie’ today. The ollie is arguably the most important trick in skateboarding because it is the foundation of the majority of skateboard tricks which require lift. When you want to do a trick like the kickflip, when you want to get onto something like a ledge, or down something like a set of stairs, or try handrails, the ability to ollie is a necessity. Therefore the ability to ollie high and with good control is critical to your total skateboarding skill-set.
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To get higher ollies, I would suggesting resting your back foot on the very end of the tail and the front foot in the middle of the deck to allow for more slide. Popping as hard as you can and catching your board in the groove of the nose with you ankle practically resting in the groove will level the board out in the air. after this initial movement slide you feet back to the bolts on the tail and nose to ensure a clean landing.