That Wham-O wheelie bar was for the kids that couldn't ride.
I remember my older brother was pretty good for a while (500' no problem), but i knew I would better him if I stuck with it. When I was 11 or 12 I was doing about 300', by the time I was 14 or 15, it was easy half mile plus. I had also been riding mini-bikes and dirtbikes starting at 5years old. Local police weren't too happy when I got my first registered streetbike...
Took about 3 weeks to be able to go all the way through the gears on the back wheel.
Of course I did it on the main drag through town for a friend one day, only to see The Man waiting. First thing out of his mouth was "Nice wheelie, think you're Evil Knievel or something?" That really didn't go so well when he saw I only had a learners permit...