First-ever indoor-stadium endurance race at 1000m altitude, held at the Karpenisi Municipal Stadium. Runners alternate direction every 3 hours (counter-clockwise/clockwise). A cardiologist's medical certificate is mandatory for bib pickup in the 24h and 12h races. Minimum age: born 2006 or earlier. Prize money: EUR 400 for the 1st place overall in the 12h race, with medals for 2nd/3rd place; all finishers receive a medal and event gift. RFID chip timing with live results. Aid stations and covered support-crew areas available throughout. Bag/clothes check provided at start/finish. Protests must be filed within 45 minutes of finishing. Medical coverage by Karpenisio General Hospital and local volunteer rescuers. Bib pickup: Friday 4 Sept 2026, 18:00-21:00, and Saturday 5 Sept 2026, 07:00-08:00 & 15:00-17:00. Information: Georgios Tsakiris (E4-Panta Vrehei president), tel. 6932909032.