I have a Treadmill and the particle board under the walking/running belt has cracked down the middle. I guess it couldn't take the pounding of 195lbs of me running on it. I'm looking to replace the particle board. It is 5/8" thick covered in melamine. I'm thinking of going to 3/4" plywood and covering it with Formica-type laminate. I suspect they used particle board, not because of its superior strength versus plywood (sarcasm), but because it is significantly cheaper than plywood. I thought about just reinforcing it from below with another layer but I think any fasteners through the board in the walking path would be a problem and screws would fail even if I used liquid nails to glue the reinforcement to the existing piece of particle board. I have it apart now, and replacement shouldn't be rocket surgery. Thoughts?