Hi, I'm Tim Phang. I'm 23 years old. I've been skating for about 12 years. I'm from Arlington, Virginia which is right outside of Washington, D.C. I'm now sponsored by Universal Skate Design, and I'm going to be talking to you about rollerblading. Half cabs in rollerblading are the opposite of alley-oop tricks. An alley-oop trick is when you start out going forwards, then you turn 180 degrees to actually be grinding backwards. The half cab, you'll start out backwards, and then turn 180 degrees, to be grinding forwards. There's a couple variations of the half cab -- there's half cab in-spin, or half cab out-spin -- the difference being which direction you choose to spin, and which shoulder you're looking over when you start the grind. Half cabs can be done in combination with any grind. You'll want to make sure, before learning half cabs, that you're comfortable with that grind without any spin in the beginning. So, to do a half cab, start out backwards. Approach the obstacle, looking over the shoulder you're most comfortable with, then jump, turn 180 degrees, land in the grind and start sliding. Half cabs are a great way to increase the difficulty of the tricks you're learning, so as soon as you feel comfortable with a normal trick, you should try half cabs to step up the difficulty.