Take a look at a variety of books on bizarre medicine, strange conditions and procedures.
What a great way to get exercise and impress your friends! Many people give up after a little practice. Many others master it in about two weeks. I saw one fellow manage to ride the length of a city block after just fifteen minutes. The easiest way to learn is find some smooth pavement next to a chainlink fence. Hold on to the fence less and less as you gain mastery.