Never thought I’d have the chance to build my own physical therapy tools, but here I am! It only took 3.5(ish) hours (which included quite some time hunting for my corner braces) and the supplies would’ve only been about $15 if I didn’t already have most everything I needed at home.
What you’ll need:
- 22″ x 24″ piece of 1/2″ plywood
- two 8″ x 3″ pieces of 1/2″ plywood, cut into a half circle with a 16° angle (should be just less than the size of the board)
- 19″ x 4″ piece of 1/2″ plywood
- six 1-1/2″ to 2″ nails
- six 3/4″ screws
- eight 1/2″ screws
- four 1-1/2″ corner braces
- wood glue
- skateboard tape
- electric tape

To start, you need to screw the 19″ board directly in the middle of the board using six of the 3/4″ screws, halfway down the 22″ side with 2-1/2″ on either side of the ends. That’ll give you a brace for the curved pieces to hold against. I did two screws on the top and bottom of each side and two in the middle. Make sure the screws are going through both layers so the bracing board isn’t buckling away from the wobble platform.

The picture shows my measurements for where you’ll be nailing in from the top. Before you go up there, though, glue the curved pieces with the center directly at 11″ from the top and bottom. Making the arch reduced the size just slightly, so the center of the curve is at 3.874″ from each side. While you’re waiting for the glue to dry, use the corner braces and screw them to either side of the curve with the 1/2″ screws.

They should both be slightly off center since the screw will go almost the entire way through the board. The black you see is electric tape that we put on the board to keep it from scuffing our wood floor. If you have carpet, I don’t think you should use the tape since that would decrease friction and make the board slide around. But our parquet floors look bad enough without a rough piece of plywood dragging ass all over it, so we gave ourselves a barrier.
Once the glue is dry and the corner braces are attached, you should be able to flip the board over and hammer in three nails on each side just for a little extra support. If all of your measurements have matched mine so far, your nails need to go 2-5/32″ in from the sides and 8-3/4″, 11″, and 13-7/16″ from the top. That should, in theory, put those nails right in the middle of the curved pieces. In theory.

If you need sandpaper to smooth the edges, I found that 100 grit paper did the trick. I wasted my time sanding, though, because I ended up covering all the edges in the end.

You’ll want something on the top to give some traction for the puppy (or human, I guess?) foot you’re trying to keep from being amputated. You could use enamel and sand if you really want to spend a few hours driving yourself crazy and making a mess. I opted instead for four pieces of hot pink skateboard tape from Academy, ringing up at a whopping $3 for the pack. Those have an adhesive already built in, so you don’t even have to glue them down to get them to stick, making it the obvious choice. Plus it comes in hot pink! The edge of ours is covered in duct tape so it doesn’t give anyone (else) a splinter. Now I just need to do something about the three splinters I got from it.

So there you go! A wobble board for $75 less than what you’d buy here, but still built to the same specs. I’m afraid to stand on it because the plywood is only 1/2″ thick, but if you wanted to use it for a human needing balance training, you could do all of that but with a thicker piece for the base.
By the way, in case you have no saw, Home Depot will cut all those pieces for you except for the curved part. A half plank of plywood will give you everything you need with a little leftover for firewood. Find a friend with a jigsaw for the curved part!