Jeff Horowitz is a certified running, cycling, and triathlon coach and a personal trainer who has run more than 180 marathons and ultramarathons across six continents. Formerly an attorney, he quit law to pursue his passion for endurance sport and now works with at-risk youth in Washington, DC, and around the world. He also coaches Team Hope, a charity fund-raising training group that benefits the Hope Connections Center, which provides free counseling and services to cancer patients and survivors. Horowitz is the author of Quick Strength for Runners, Smart Marathon Training: How to Run Your Best Without Running Yourself Ragged, and My First 100 Marathons; 2,620 Miles with An Obsessive Runner.