How will the foam tiles hold up underneath a treadmill and exercise bike? I’m not concerned about denting...the equipment won’t be moved. More concerned with sliding of the equipment or the foam tiles. The tiles will be installed over a plywood subfloor.

The weight of a treadmill would be enough to hold these tiles in place very easily and would dampen sound created that would otherwise reverberate through your subfloor. The relatively light exercise bike might not be stable on the tiles however. Because an exercise bike usually has a different displacement of weight than a treadmill, you'd likely want to go with our High Density (HD) foam tiles for the bike.