Perhaps your perfect "gym" isn't a gym at all, but rather the great outdoors. Can't afford an expensive gym membership? Sick of the grunting "muscle heads" if you can?Perhaps your perfect "gym" isn't a gym at all, but rather the great outdoors.Get ready to head outside for fitness training as trainer/coach John Abdo talks hiking, walking, bicycling, climbing, and more in this continuation of the Intro to Exercise series.