Cerox + Iron
Always double-check with the organizer's website! This page may contain affiliate links.
Event
CEROX + IRON takes place on Saturday, February 28, 2026, in Frederick, Colorado. The venue is listed as 3771 Monarch Street, Unit F & G, Frederick, CO 80516. The event offers four entry options: Cerox Individual, Cerox Teams of 2, Cerox Iron Individual, and Cerox Iron Teams of 2. Teams consist of two people and may divide the work across zones as they choose. Cerox combines running with a sequence of fitness zones. Cerox Iron uses the same sequence of zones but does not include the running portions.
Workouts
The Cerox sequence alternates running segments and eight fitness zones. The running segments are 400 meters each. The eight zones are: Zone 1 - 400M Row Erg; Zone 2 - 30 deadlifts (155/105 pounds); Zone 3 - 400M Ski Erg; Zone 4 - 20 sandbag tosses over a 4-foot bar (100/70 pounds); Zone 5 - 75M walking lunges (RAM 55/33); Zone 6 - 200M farmers carry (two 60s or 40s); Zone 7 - 30 calorie Echo Bike; Zone 8 - 30 burpees to plate. The Cerox Iron workout contains the same eight zones in the same order without the running segments. Visit the organization's website for the most recent information.