For most of us, our phone is an adult-version of a security blanket. Without it we feel isolated, lost, and let's face it, bored. C'mon, admit it: Haven't there been a few times when you almost ran into a pole, a mailbox, or a stranger because you were thoroughly absorbed in a work email (or more likely, a vicious round of Words with Friends)? Thought so.

Despite the hazards that come with being distracted, you can't help but succumb to the smart phone's lure. With just a tap of your finger, you can "like" your friend's Facebook picture, see what Kim Kardashian is having for lunch today, and get up-to-the-minute breaking news. No need for a TV, a computer, or a personal assistant. And now, there's just one more reason why you should tighten your grasp on that little gadget: It'll make you skinny.

Skip ahead to see the 12 best fitness apps that'll make you skinny now.

That's right. Because of the ingenious entrepreneurship of app creators, there are now apps for every fitness and diet need imaginable. Need some sage advice that'll pry the cookie dough out of your hands at 3 a.m.? There's an app for that. Want a personal trainer to yell at you for slacking on your target pace? There's an app for that, too. Need motivation to get off the couch and start running in the first place? Yeah, you get the drift.

And while there are hundreds of applications out there that promise to offer you the same results as a gym or personal trainer, we sifted through all of them and boiled it down to the best fitness apps that'll help you lose the most weight. These 12 apps have the latest in GPS, motion sensor, and bar scanning technology to give you all the tools you need to get in the best shape of your life -- fast. See the 12 best fitness apps now.