In the warmer months, why not abandon energy-hog treadmills and exercise machines at the gym and use the great outdoors instead? Hiking in the wilderness can be just as good a workout, plus you get the scenic views of nature while you work up a sweat. To find a variety of trails to hike near you -- from beginner level to seriously intense ones -- use the website TrailLink (traillink.com). It has everything from biking to running to walking trails to help bring the outdoors closer to you.