Unless you take the M.C. Escher approach, which doesn't work in our present reality, what you need to do is build a 400m track that slopes up all the way around until the finish line and then put a fireman's pole in each lane at the end where runners to drop back down to the start.
RE: Is it physically possible to build an uphill 400m track?8/10/2018 2:52PM - in reply to Up Up and Away
If you had the whole thing on hydraulics that tilted the track 'upward' depending on where the runner is, does that count? Only work for one runner or group of runners on the same sport of the track at a time.