In the early 1980's I was working in a chiropractic office
in Florida. One day a young woman about 21 years of age
came in complaining of neck pain. This pain had an unusual cause.
She told me that she was doing ONE ARM handstand pushups against
a wall and lost her balance causing her to fall on her head!
She told me that before this accident she regularly did from
five to ten of these ONE ARM handstand pushups! To get an idea
of the difficulty of this feat try doing a two arm handstand
pushup against a wall. I bet not many of you could do even this.