I got this app and I'm starting it on Monday! I tore my ACL 4 years ago and had it replaced a year ago so I haven't jogged in 4 years!! But I got another app called "Zombies, Run!" and wow I love it!!! You can walk, jog, or run to your own music... and every now and then a mob of zombies will chase you and you have to pick up the pace to outrun them. I normally do a power walk and then I jog during the chases. It's not as much jogging as the C2 5k so I feel like it really got me ready to do it. I think it's a GREAT app for people (like me) who haven't jogged in years. My knee feels better than it ever has since I started!
Ha, don't mean to advertise another app, but I REALLY think it's a great prep for the C2 5k program