A wave-board is like a skate board except that it has two wheels and you don’t have to touch the ground. It has two plates which are connected by a pole that can rotate from side to side. One plate is for the right foot and the other is for the left foot. Of course it depends which foot you prefer to have forward.
The way to move is to push one foot down and the other foot up like pushing peddles of a car; this swivels the board like a snake and make you move forward. It is surprising how fast it can go.