So here's the deal.  David Beaudry a friend and fellow SSQ instructor carries this damn thing around wherever he goes.  A bunch of us were at a Bronnikov Training in San Diego and he had it with him.  We all played with it.  I didn't think much of it at the time.   However, winter struck and I needed some way to excercise because I was not Surfing, so I bought one of these things.  I freakin' love it.  I highly recommend trying it.  It's a really fun way to workout.  No weights, take it anywhere,  ENJOY