Australian GPS Sports offers teams the ability to wire their players up and get the lowdown on their performance. The SPI Elite, pictured above, can be worn either affixed to a vest or strapped to an athlete's back. Coupling a GPS with an accelerometer, it monitors everything from heart rate, running speed, current position and even how hard the player is hit on impact. It's also weatherproof, which is good for coaches but bad for athletes.
This kind of technology would give coaches a valuable insight into the inner workings of their team and help them train players more effectively. It also might help guard against serious injuries, as players who were getting run down could be pulled out. The technology is currently being used by Australian sports teams, and some players allow their vitals to be shown during broadcasts for the audience at home.