As I shot down the face of the run, spray flying, I spotted the next dip in the water over to one side. A touch of the rudder pedal, a slight lean and the surfski turned towards it; through the dip and a neat curve in the other direction and I'd shot around the shoulder of the wave, accelerating again onto the next run. A crazy thought ricocheted around my brain: What was it that produced this feeling of extreme pleasure? Adrenalin? Endorphins? Dopamine? All three? Whatever it was, the feeling of playing with a new boat definitely added to it.