What started as an ‘ultra-experiment’ for young Nathan Coury’s college thesis on fat oxidation and ultra running, becomes a 48 hour family fixed-time festival celebrating our season at Nardini Manor!

We beefed up the original Ox to bring you 48 hours of ultra fun on the flat and fast custom built gravel running track at the historic Nardini Manor.

Run your own experiment and push beyond your limits on the USATF Certified 500 meter course.  It’s perfect for your first ultra, your first 100 mile, or your own personal best; a 48 hour time limit to discover your inner animal! 

We’ll have a fully stocked aid station directly on course and you can setup trackside for ultimate convenience. We also invite you to stay the weekend and camp onsite!

Invite your family and friends to spectate, cheer, camp, and participate! Families with kids enjoy a special race on Saturday: a 500 meter dash and fun for all ages!

Join us four our fixed-time season finale and share with your friends and family the joys of Nardini and the community of runners that make it so special. We will cheer you whatever your goal and celebrate and express our thanks for our running community and run fam!

Choose the 48 Hour, 24 Hour, or 12 Hour and join us for a pre-holiday hoopla!