Surfing is tough to learn. Today’s invention is a surfboard which tries to make the whole balancing on a floating board thing a little easier.
In calm water, a training surfboard could be fitted with a pressure pad on the upper surface and a small directable drive unit on the underside (with shielded propeller).
The pressure pad could detect pressure asymmetry on the board and direct the propeller to steer towards the higher pressure side.
This would be controlled by the kind of neural network which can be reliably trained to help with pole balancing in realtime.