Ever since I got my new bike, I've been practicing a couple tricks. For example, there's the bunnyhop where you make both wheels come up off the ground. I've been working on that one for a while and finally got it.
Here's how you do it: You have to get a good grip on the handles, but you also have to get a good grip on the pedals with your feet, so that you can lift the back wheel while doing the same with the front wheel. So you need to lean forward, do a small wheelie and lift up the back wheel with your feet at the same time. Sounds kinda difficult--but if you practice, you'll get it!