Cross training and running go together like peanut butter and jelly. If you build it into your schedule intentionally, strategically, and with a clear understanding of what you're trying to accomplish, you'll thrive. Megan makes the case that cross-training serves runners for several distinct reasons, and the right reason for you will shape how you approach it.
Are you prone to soft tissue overuse injuries? Maybe a serving of Achilles tendonitis, paired with some iliotibial band syndrome, and a splash of plantar fasciitis sprinkled on top? A helpful strategy for keeping these dreaded pains away is to avoid doing two consecutive runs that look the same. Changing the terrain, slope angle, footing, or intensity of your run can go a long way toward keeping your body healthy.