By Hanna Brooks Olsen for Blisstree.com
As the weather gets chilly, even the most hardcore outdoor exercise-lovers start to head inside, trading their trail shoes for something more treadmill-friendly. But if you’re usually an outdoor runner, hiker, or other open-air exerciser, moving into the gym can come with a host of new concerns. Here are five things you can do to protect yourself from indoor injury…and boredom.