3 ms·
If you look on youtube for this event, you'll see there was a vehicle driving in front of the pack that was aiming a laser at the feet of the runners. It appear
by danny_taco 7y ago
If you look on youtube for this event, you'll see there was a vehicle driving in front of the pack that was aiming a laser at the feet of the runners. It appears to make it easier to follow a pace very accurately by making sure your feet are following the laser.