Distance Running Find Things to Do Near You Activities Tips & Training Test your limits and stay fit and active through long-distance running. Use this resource to find running events, pick up training tips and connect with other endurance athletes like you. The Biggest Marathons in the U.S. Dream of one day running 26.2? You might as well go big. Here are the 10 largest marathons in the United States. 11 Finish-Line Photos That Inspire Whether it’s your first or 100th race, crossing the finish line brings a feeling of accomplishment.