Lay two pieces of 2-by-4-inch wood parallel on the ground and 5 centimeters apart. The wood should be slightly longer than your board's length.
Cut two pieces of wood so that they create a "T" shape and can fit in between the 2-by-4s with the edges resting on them. Position them so that they are approximately 30 centimeters shorter than your board on either end.
Nail the pieces together from the bottom of the 2-by-4s.
Cut the six pieces of plywood so that they are rounded at both ends. The board should be 1.3 meters long, 23 meters wide at the center, and 26 meters wide on either end.
Place the first piece of plywood into the bender you made and glue together each of the six pieces using wood glue.
Place bricks or another heavy object in the middle of the plywood so that the middle presses to the ground and the ends bend up on the edge of the bender. Leave for 48 hours before moving on to the next step.
Cut a piece of formica to the same size as the plywood and glue it to the bottom. Clamp these together for 48 hours before moving to the next step.
Stand on the board and mark where your feet are.
Screw two straps of strong material in the position where your feet will be. These straps will hold the board to you.
Sand the edges and top of the board to a smooth finish. You can stain the board as well.