After you start a new game, you will very quickly come across turnups in the ground. These turnups are found all throughout the game, and levels can be revisited.
Move Rayman on top of one, press
to hit it out of the ground. Then, meet it midair by jumping (
) up to it and then punching (
I understand it's unnecessary to include a video on a solution this simple, but I'm seeing how comfortable I am making videos for this type of stuff. So I'm going to include one anyway.