Flee from zombies and giant boulders with the Race Yourself fitness app for Google Glass

This would be great for making our rehabilitation harder and getting more repetitions in. Hell I'd probably learn how to run again by using this, even if they caught me numerous times.
http://thenextweb.com/apps/2014/01/08/flee-zombies-giant-boulders-race-fitness-app-google-glass/#!sthRA
Fitness apps seem like a perfect fit for Google Glass, given that the head-mounted computer is devoid of wires and requires a minimal amount of input from your digits.
Race Yourself is a promising piece of Glassware that, using augmented reality, gives you an avatar to compete against in the real world. Over 30 game modes will have you racing against yourself, a giant Indiana Jones-style boulder and even hordes of zombies.
The app will also support multiple activities, so you can cycle against the Peloton in the Tour de France or skydive through virtual rings in the sky.