This virtual challenge invites runners, walkers, joggers, and cyclists of any age or ability to rack up 100 miles during a calendar month using whatever tracking method works best for you—whether that's a fitness app, watch, or simply keeping notes. Just log your miles starting on the first day of the month and submit your total by 5:00 PM on the first day of the next month through RunSignUp. You can customize your goal (beginners might aim for 50 miles while seasoned athletes go for the full 100) and connect with fellow participants on Facebook and Strava for support and encouragement along the way.