Here are some ideas:
Wobble forward and backward or side to side.
Try with your eyes closed.
Stand on one leg. (carefully!)
Balance a book on your head while wobbling.
Try all of the above (very carefully!)
Play catch with someone while standing on the wobble board.
Time yourself to see how long you can keep your balance without an edge touching the floor.
Common sense woodworking rules apply. Be safe, read and follow the safety guidlines in your power tool manuals, measure twice, cut once, etc…
Materials and tools:
3 feet of 2”x4”
18”x18” piece of 1/2 inch good quality plywood
2 ½” inch wood screws
Circular or table saw
Jigsaw or bandsaw
Sandpaper or beltsander
Grip tape (optional)
Step 1: Support and Wobble Pieces
Step 2: Mark Curved Pieces
Step 3: Cut Curved Pieces
Step 4: Cut Center Support and Deck
2. Cut an 18"x18" inch piece of 1/2 inch plywood. I'm using Birch plywood, but any nice smooth and strong piece will do. Your local hardware/home/lumber store often carries them in 2'x2' foot sections.
Note: For both of the above steps, use a table saw (preferably) or a circular saw.
Step 5: Sand Curved Pieces Smooth
Step 6: Center and Screw in the Support Piece Under the Deck
Mark a dot and drill a 1/8 th inch pilot hole 9 inches from one edge and 5 inches from the other edge. Do the same on the other side.
Carefully align the support piece to the center and screw it in tight against the deck thru the pilot holes from the top of the deck.
Step 7: Align and Screw in Curved Pieces
Step 8: Screw in Curved Pieces From the Top
Mark 2 dots and drill pilot holes at 2 1/4 inches from the edge. Go 1 1/2 inches to either side of the 9 inch center. (7 1/2 inches from either opposite side). Do the same for the curved piece on the other side.
This distance will put the screw in the middle of the curved piece underneath and not make the 2 1/2 inch screw protrude thru the curve.
Step 9: Done!
Happy and safe wobbling!