From the golden years long before man made bumps. When it all started by the name of HOT DOGGIN.
With teams like White Stagg and names like Sotti Brooksbank.
http://www.youtube.com/watch?v=MGhCVifDPws
I grew up nest to Scott in Sandy Utah and he showed me how to do my first 360*
I was like 12 years old and it was done in a field behind the local elementry school.