Circadian Endurance Challenge

Circadian Endurance Challenge!

Circadian Endurance Challenge

72 HOURS to log AS MANY MILES AS YOU CARE TO! You may choose your terrain - treadmill, track, trail, roads. The catch? To earn a belt buckle, at least 50 of your miles must be logged during the night! Night time miles will be defined as 7pm to 7am. After all, this IS the Circadian Endurance Challenge. It wouldn't be fun, if it wasn't messing with your Circadian Rhythm!


The Circadian Endurance Challenge is a virtual event. Any three consecutive days that you choose in August. This option is open for you to pick whenever you want to run. You have 72 hours to get as many miles possible. The challenge is are you doing night miles on day 1? Or day 2 and 3?!

This event will need proof of distance. This will be done by sending an email with the time and date stamp showing when you started your 72-hour clock. Take breaks anytime you want. Each time you end a run, capture your distance with a time and date stamp. If you are electing to do the 100-mile race, once your clock starts, it does not end until you hit 100 miles. You must also show that you did 50 of the miles during the “night-time” hours (7pm to 7am)

Any time and date stamp after the 72-hour clock will not count. If you stopped several times, you should plan to take a photo of each final distance for that segment. Send all the captured photos that add up to equal your entire distance. If you reach 100 miles in the 72-hour time limit, and have at least 50 miles during the night hours, we will send you a buckle. A buckle can be earned in either division. WANT TO DO BOTH? YOU CAN! Simply register for both the 72 Hour and 100 Mile events and earn a buckle for each!


SHIPPING METHOD: Default mailing is USPS. It will come with a tracking number and $100 insurance. If you prefer expedited mail, please contact us and we will make it available at cost.


ELIGIBILE DATES THIS YEAR: This year, we will allow you to run from August 1 @ 12:00am until August 31 @ 11:59pm. You must follow race protocol and email prior to starting your "clock". Information will be emailed out prior to the start of the race about logistics and swag.. Questions? Email us!

SWAG: All participants will receive some kind of giveaway at event conclusion.
Only participants who email in results will receive swag. If you don’t share it, we don’t know you did it!

Any participant who logs 100 miles or more with at least 50 night time miles, will earn a signature event buckle. If you register for both divisions (72-Hour and 100 Mile), you may earn a buckle for each.
We love our first responders, active and former military personnel and civil servants! If you are a teacher, paramedic, military member, etc. use code SERVICE! to save 10% on one or both registrations! Thank you for your service!