Frontside and backside airs are the first tricks you normally learn in a pipe, but before moving onto spins, there’s a further category to understand: ally-oop airs. An ally-oop is one in which you go up the frontside wall and do a backside air (and vice versa). In effect, you’re turning the ‘wrong’ way on the pipe wall – against the direction of travel. They’re a great-feeling trick and nice one to learn as it’s a relatively simple, 180 degree movement. Plus you don’t end up gathering lots of speed - alley-oops are a perfect way to slow things down, making them super stylish to boot.