wakeboard

n.

A buoyant board (resembling a surfboard) that is used to ride over water while being pulled behind a motorboat.

Wakeboarding is a surface water sport. It was created from a combination of water skiing, snow boarding and surfing techniques.

Before it was called wakeboarding it was called skurfing (ski + surfing).

kneeboard

n.

A short surfboard ridden on the knees while being towed behind a boat.

v.

To ride a short surfboard in a kneeling position.