InHouse Ultra

InHouse Ultra

InHouse Ultra is a last one standing treadmill competition held inside Run Unlimited and Twenty One Run. The field is limited to 33 athletes nationwide for this third edition of the event. The format requires each athlete to complete five miles every hour, on the hour. Runners must finish all five miles before the next round begins; failing to complete a round results in a DNF. Athletes may not accumulate or "stack" miles across rounds, and standing on the sides of the treadmill while the belt is moving is not allowed. The final athlete remaining wins.

Participants must be self-supported for fuel and gear. Each athlete may have one crew member present, but no assistance is allowed during treadmill sessions. A recovery zone is available between rounds. The event space is temperature controlled to 72 degrees. Movies and music will rotate during the event. Athletes are asked to bring their own chair and cooler for specific nutrition needs. Family and friends may attend to cheer, with the note that studio space is limited.

The description focuses on race format, participant limits, and on-site support conditions. It does not include entry procedures or scheduling details. Visit the organization's website for the most recent information.