Two laps of a 250 m velodrome, two riders, identical legs. You lost the toss, so you lead. The wheel behind you is worth 88 W while you are doing 40 km/h and 378 W once you are doing 65 — the cube of the speed, exactly — so the rider on the front decides what the rider behind them is getting.
Hold SPACE and you spend everything your legs have left; let go and you hold the wheel in front, or hold your speed if there is nobody there. Z sits up, which is how you make the front an unpleasant place to be. The pale wedge is the hole in the air; the slice at the bottom left is the slope you are standing on.