A few years ago some high school cheerleader found out that the world record for regular backflips was ridiculously low (for a world record) and broke it easily, then someone else broke it again. The previous world record was so low that about any collegiate gymnast could have set the world record. One-handed backflips, however, are not something you see every day, and it looks a lot more fatiguing.
I wonder if he switched hands after 25 or so, whether he could have gone to 50? Though that is probably a separate category.