yeah, i can pedal grab.

There are two basic techniques:

find something that isn't that high. just enought that your tire won't touch the ground during the pedal grab. At first, try to jump and catch the entire pedal and crank (don't land on the bearing holders). If you miss the crank and just catch the pedal, that's fine too. The main thing is to transfer all your weight to the catching foot (the other foot is off the pedal and in the air upon doing the grab). In the beginning, if you have only caught just the pedal, bring the uni up and, with your other foot now on the pedal, try to shuffle the uni so that the crank and pedal are on the obstacle. From there, jump again, to riding on the obstacle. The above technique works only if the area you're going to has enough room and is shaped appropriately for both pedal and crank. it's better though to go just to the pedal and then directly up to riding on the obstacle. To do this you :

1) Get up to pedal grab (not crank), or just get into this position without doing the first part (one foot standing on the pedal on the obstacle, the other foot in the air on the other side of the uni). The uni will be hanging below you, rotating on the pedal.

2) Swing the uni back and forth, rotating on the pedal. Then on the upwards back part of the swing, catch your outer foot on the pedal, and bring the uni up underneath you so that you rise up slightly into the air, and land on top of the obstacle.

Eventually, you can do this with very little movement of the cranks, making grabs of more awkward obstacles like fences and the rounded sides of big logs possible.