We have always seen this Bike on a tightrope at the science center (at the water-park area),
but have never even thought of attempting to ride it. The bike is probably 10 feet from the ground... actually from the surface of the pond.
Last weekend when we visited with Gadget-daddy, he decided to take the plunge (which seemed impending if you were to lose your balance.)
Just sitting on it at first was "scary", said, Gadget-daddy. He sat for maybe 3 seconds on the stationery bike gathering up his nerves before peddling forward.
After the first round, he was a bit more confident and did it three times in total. Of course the boys were excited and wanted their daddy to give them a ride. "No," was the resounding chorus from both very excited parents.
You did it! You overcame your fear!