Today, when an old injury reminds you that your body isn't quite what it used to be, your health will be at the front of your mind. You'll start to rethink some of the advice one of your fit friends recently gave you: getting more active and reminding yourself what it's like to sweat are two things you need to start doing. You might not be eager to get back in the gym, but you will have an undeniable pull to get more active more often. This is a great trend.