Amount of GPE available is only equal to the work that your muscles did to lift the weight of your body to where it could come back down and leverage against the water.
Plus, you don't go forward by pushing straight down on the water. The force has to be transferred to the board through your feet. That is accomplished using muscles.
EZ Launch™ Kayak & Canoe
Kayak & Canoe Outriggers
Gedi Convertible Helmet
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