https://www.zombiesrungame.com/
I'm going to start by saying I haven't tried the training one out yet because I do not have an iTouch or iPhone and the android version is not out yet
I did buy the game for my phone and will be trying it out at my next workout but IDK how well it will work on the elliptical since I can't really run... (which is why i want the training one)
I thought others may find it fun