09/25/2026
Before Frontline had the Kraken, the Vest Collector or many of the obstacles athletes now recognize, there was Thermopylae.
The now-retired obstacle debuted at the Second Wave in 2018 after being donated by HartFit ELEVATE OCR , doubling the version already waiting for athletes at their Illinois training facility.
Thermopylae was like Spartan’s Olympus—except it wasn’t.
Imagine taking Olympus, inverting it and forcing athletes to traverse laterally while feeling as if they were hanging from the side of a cliff. Keep your feet off the ground. Maintain control. Reach the other side and hit the bell.
Simple enough.
Now put on a 20-pound vest.
Suddenly, every grip mattered. Every shift of the hips mattered. And gravity became considerably less interested in your plans.
Thermopylae appeared at Frontline for only three races before the realities of time and weather caught up with it. Wooden obstacles have an expiration date.
The memories they create do not.
For everyone who fought their way across Thermopylae—or found themselves introduced to the ground beneath it—this obstacle remains part of Frontline OCR history.