What is "wisping" a horse?

Natural horsemanship professionals swear by various kinds of massage - but old school horsemen have been doing it for years.

It's called 'Wisping' - and you make a massage pad out of a rope of hay, and bring it down with some force on the horse's major muscles. Traditionally, it was supposed to help tone a horse's muscles, but it's now known that it actually helps the horse relax and when done after work reduces muscle stress. Unfortunately, not many people know how to make a wisp any more.