Here’s the test: Players must run a total of 900 yards in six legs. Each set consists of 25 yards out and back three times. They must finish that heat of 150 yards under a designated time — 32 seconds for the offensive and defensive linemen, 29 seconds for the tight ends and linebackers and 27 seconds for the wide receivers, running backs and defensive backs. If you go over that time in any of the six legs, you flunk the test and have to take it over.
The break between each set is 64 seconds. By the end of it, players are sprawled on the ground, trying to catch their breath.