MP3 players serve many purposes in our lives. They drown out the crazies on public transportation, keep our road rage in check during rush hour, ensure that we're entertained on long flights, and help us stay motivated at the gym. In fact, one of the top reasons why people buy portable audio devices is to have them as fitness companions. And you may not know it just by looking at them, but the iPhone and iPod Touch are excellent tools for watching your weight and keeping in shape--you just need the proper enhancements.
First and foremost, if you're going to be exposing your skinny little iPod to the indelicate environs of the gym, make sure you wrap it up in a nice, protective case. Then it's onto the fun stuff: apps. The iPhone and iPod Touch have a vast array of third-party applications tailored for just about you can put your mind to, and that includes fitness. But rather than letting you wade through the sea of options out there (and, in fact, maybe ocean is a more appropriate metaphor), we've rounded up five of our favorite fitness apps right here. OK, OK...actually, there are seven--we just couldn't resist throwing in some tangentially related selections.