With the bike on the center stand, engine running, both feet on the pegs, use your weight to rock the bike back and then launch off the center stand without touching the ground.
This just reminded me of something my brother did with his CB500 SOHC4 once. This goes back to before Wal-Mart escaped Missouri: it was then a discount chain store, and he bought a discount rear tire (of mysterious brand) for his Honda. When he got it mounted it was almost 1/8" out-of-true (high-to-low, measured with a ruler being pushed back from the tire as he rotated it) and the issue was in the body of the tire. He surmised this was why the tire was REALLY cheap (like $15 in 1973 cheap), but he was a broke college kid, so he decided to 'make it round enough'. He got it up on the centerstand and ran it up to 3rd gear, almost wide-open, then leaned back ever-so-gently until the tire started hitting the garage floor. He ended up in 5th gear at 5000 RPM doing this, until the smoke rolling out of the garage got grandma out of the house to go see why the garage "was burning down", she thought: he ended up with a giant black mark on the floor under the bike and tire debris all the way out of the garage door before the tire showed wear marks over more than 50% of the circumference. The smoke filled the garage so much he couldn't see grandma coming in, and she started waving her arms while standing alongside him to ask what he was doing?
The next day he rode back to college (170 miles) on it, and rode on it until the low spot on the tire started showing cord (the next Spring). He said it was a nightmare to corner it on high-speed roads (which abound in Missouri) because he couldn't predict where it was going to go as he entered each turn.