If Track and Field has events like relays, and hurdles why not do shuttle run, or even the zig zag ? What does hurdles prove? What does relays prove? There are races that are basically the same thing except the distance are extended: 100M, 200m, 400M. But why not test the ability to start, stop, and start again, and the ability to change vectors? Shuttle runs are in fact used often for team ball sports to determine who makes the cut or not. At least at the lowest amateur levels like HS ball. In swimming races, you have to swim to far end, stop, flip and go back. In downhill skiing, you have to zig zag. The tracks are usually surrounding a large grassy field. Be waste to not use it for something. Soft ground is perfect for stopping and going, and change of direction. It is easier on your ankles.