Here’s Dean Potter climbing a high ball boulder in Yosemite. (I think he climbed this in ‘07, but the video is fairly recent.) He kept this project secret by washing off his chalk marks each time he attempted this climb.
About halfway thru the video, he falls and says,
“When I fell my feet traveled 20 feet before impacting the pads. I was lucky not to shatter bones. My quads were very sore and I limped around for the next few days.”
More of his story of this climb here.