On a visit to see Charlie in December, I was able to see him put an athlete through a treadmill tempo workout.
The sprinter was mid 10 100m level.
For each speed level, take 100 steps on the treadmill:
8.0 mph
8.0 mph
8.5 mph
9.0 mph
9.5 mph
10.0 mph
10.5 mph
11.0 mph
10.0 mph
9.0 mph
After each 100 steps, the athlete performed abs and other exercises on a mat right next to the treadmill. The treadmill allowed it to stay on while the athlete as on the floor. I have heard some models stop once the person is out of range of it’s sensor. For those, I would guess just re start it everytime, or if you have a partner, have them stand on the side rails to keep it on.