Name: CEROX + IRON + IRON X
Start: 2026-09-19
End: 2026-09-19
Location: Frederick

About the Event

Get ready for a functional fitness challenge built for all abilities.

You’ll take on 8 fitness zones designed to test your endurance, strength, and grit. Choose your level of challenge:

Cerox: The event will feature 8 fitness zones plus running.\

Cerox Iron: The same zones as the classic Cerox event, but without the running.

Cerox Iron X: Twice the grind, none of the miles. Double the reps, double the work.

You can sign up as an individual or with a partner team. Teams can divide the zone work however they choose.

Cerox Workout:
400M Run
Zone 1: 400M Row Erg

400M Run
Zone 2: 30 Deadlifts - 155/105

400M Run
Zone 3: 400M Ski Erg

400M Run
Zone 4: 20 Sandbag Over 4' Bar - 100/70

400M Run
Zone 5: 75M Walking Lunges - RAM 55/33

400M Run
Zone 6: 200M Farmers Carry - 2x 60's/ 40's

400M Run
Zone 7: 30 Cal. Echo Bike

400M Run
Zone 8: 30 Burpees to Plate

Cerox Iron Workout:

Zone 1: 400M Row Erg

Zone 2: 30 Deadlifts - 155/105

Zone 3: 400M Ski Erg

Zone 4: 20 Sandbag Over 4' Bar - 100/70

Zone 5: 75M Walking Lunges - RAM 55/33

Zone 6: 200M Farmers Carry - 2x 60's/ 40's

Zone 7: 30 Cal. Echo Bike

Zone 8: 30 Burpees to Plate

Cerox Iron X Workout:

These values represent the 3-year monthly averages for September in Frederick.

thermostat Temperature

10.9° / 27.5°

wb_sunny Feels like

8.8° / 24.5°

light_mode Avg sunshine hours

11h 15m

water_drop Avg rainfall

1.2 mm

ac_unit Avg snowfall

—

air Avg wind speed

7.2 km/h (Light breeze)

opacity Sweat loss rate

Moderate

terrain Course conditions

Firm and slightly soft

sunny Max UV Index

Moderate (5.0)

humidity_mid Humidity

48.7%

wb_twilight Sunrise

06:41

nightlight Sunset

19:06

About Frederick

Learn more about the host city, Frederick.

The Town of Frederick is a Statutory Town located in Weld County, Colorado, United States. The town population was 14,513 at the 2020 United States census, a +67.22% increase since the 2010 United States census. Frederick is a part of the Greeley, CO Metropolitan Statistical Area and the Front Range Urban Corridor.