The barspin is a staple of BMX stunts. Definitely a stunt a beginner can learn with a few hours of intense practice. You should be able to master it without much problem. The steps for the trick are written here.
1) Ride on a flat, open area to start. Pedal at just enough speed to make it easy to keep your balance.
2) Pull back to lift the front tire of the bike off the ground.
3) Grab hold of the seat with your knees and lean backwards to stabilize the bike and keep your center of gravity towards the back of the bike.
4) With the front tire in the air, take one hand off the handlebars. Spin the handlebars while maintaining your balance on one wheel. Try just one rotation at first. As you get more comfortable, you'll be able to do more.
5) Catch the spinning handlebars so that the front tire aligns with the back. Drop the front tire back to the ground while continuing to roll.
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