Rango said..
He,s over exaggerating the term ,its more of a distrution of weight .Zero mast foot pressure results in tail walking and out of control too much weight back away from mastfoot,common with first planing experiences in footstraps and harness.
mast foot is far in front of front wing and board don't nose dive, so I think mast foot pressure is irrelevant in windsurfing physics free body diagram, sailor weight position is what is important.
