These are several videos of Matchbox cars racing on a treadmill. They're attached to the front of the treadmill via clear tape, and there's plenty of exciting side-to-side action as they battle for position. You know, it's really amazing the creative things a person can come up with to entertain themselves when they're fully committed to not exercising.
Keep going for the videos.
Thanks to Jeff L, who agrees this is exactly what treadmills were invented for.