Fred Bernik & colored circuits

The Secret History of the Bouldering Circuit: How Fred Bernik Changed Fontainebleau

While the history books clearly document the incredible impact of Fred Bernik’s work in 1947, Bernik himself remains a somewhat enigmatic figure in the climbing world. Unlike many of his contemporaries who actively sought the limelight or meticulously cataloged their alpine ascents, Bernik was a practical, understated mountaineer focused entirely on solving a functional problem: bridging the gap between lowland training and high-altitude endurance. He belonged to a generation of post-war Parisian climbers who viewed the forest not as an arena for personal fame, but as a shared laboratory for human movement and physical preparation. By looking closer at his life, we see a man driven by a quiet, methodical passion—someone who was just as comfortable carrying a heavy pack through the mountains as he was carrying pots of paint through the chaotic boulders of Cuvier Rempart.

From guidebook to circuits

The development of Fontainebleau’s climbing documentation happened in stages. Maurice Martin’s 1945 guidebook recorded routes, grades and the locations of boulders. Two years later, Fred Bernick began marking a circuit at Cuvier Rempart with coloured dots and arrows. The guidebook made individual problems easier to identify and compare, while the painted circuit connected multiple problems into a sequence that could be followed through the forest.

What are Colored Circuits

A Fontainebleau circuit is a list of problems with the same grade. It links a series of boulders into a marked route through the forest, usually using coloured dots, arrows and numbered problems. The colour indicated an approximate difficulty level, while the sequence created a longer physical outing than climbing one isolated problem.

Roots of the Circuits

If you have ever stepped foot in a modern indoor climbing gym, you are intimately familiar with color-coded grading. You walk up to a wall, spot a blue or red tag, and instantly know whether you are looking at a warm-up or a project. But this system didn’t start in a commercial gym. Its roots trace back to 1947. It was started by one mountaineer: Fred Bernik (often spelled Bernick).

The Alpine Dilemma: Why the Woods Needed a Track

In the 1930s and 1940s, climbers from Paris used the chaotic sandstone chaos of Fontainebleau for one primary reason: to train for grueling alpine expeditions in Chamonix and the wider Alps.

Led by legends like Pierre Allain, these early pioneers tackled individual, highly technical blocks. However, they faced a massive physical limitation. Boulders in the forest averaged only a few meters in height. While trying a single hard move over and over built explosive power, it did absolutely nothing to prepare a climber’s lungs and forearms for a 1,000-meter vertical face in the high mountains.

Enter Fred Bernik in 1947.

Bernik realized that while you couldn’t make a four-meter sandstone block taller, you could make it longer. His breakthrough idea was simple yet revolutionary: link dozens of individual boulders together into a continuous, non-stop “journey” across the forest floor.

1947: Fred Bernik Painted the Chaos at Cuvier Rempart

To bring his vision to life, Bernik headed to the steep, quick-drying hillside of Cuvier Rempart (often referred to as Bas-Cuvier).

Armed with pots of colored paint and brushes, Bernik began marking the sandstone. He established a definitive sequence of movements:

• The Rules: A climber would top out problem number 1, follow a painted arrow or dot across the top of the block, descend safely, and immediately start problem number 2.
• The Goal: The objective was not just to finish the moves, but to complete the entire continuous circuit as fast as possible with minimal rest.

By forcing climbers to complete dozens of problems back-to-back, Bernik successfully simulated the pacing, mental exhaustion, and deep endurance required for a big alpine mountain day.

Ultimately, Bernik developed five distinct colored circuits across the Cuvier boulders. Each color represented a different tier of physical difficulty, establishing the world’s very first standardized outdoor grading scale.

Why Bernik’s System Forced Technical Mastery

Before Bernik’s circuits, climbers naturally gravitated toward blocks that suited their personal anatomy or strengths. If you excelled at micro-crimping, you avoided the terrifying sloper mantles.

The circuit format completely destroyed this comfort zone. Because you had to follow the numbers sequentially, you were forced to confront whatever the forest threw at you next. To finish a full Bernik circuit, a climber had to master:

1. Friction Mantles: Topping out rounded, featureless sandstone slopers without using your feet.
2. Static Precision: Utilizing delicate body positions, twistlocks, and counter-pressure rather than dynamic lunges.
3. Pacing and Flow: Learning when to shake out, when to breathe, and how to move efficiently when completely pumped.

Circuits change over time

According to Bart van Raaij, circuits change over time. A white circuit in 1980, for example, could differ from a white circuit in 2000 both in difficulty and in the boulder problems it contained. This makes it difficult to compare climbers across different periods. Completing a circuit, or the time it took to complete it, does not necessarily tell us how a climber from one period compares to a climber from another.

From the Forest to the Modern Gym

What started as a training hack for French alpinists quickly evolved into a full-fledged cultural phenomenon. In the decades that followed, subsequent generations of Bleausards expanded Bernik’s framework, creating massive endurance tracks.

Today, every single time you walk into a climbing gym and look for a specific color to match your ability level, you are participating in a system born in 1947. Fred Bernik didn’t just paint the rocks; he gave the climbing community a global language for progression, endurance, and technical movement.

Sources

Rock+Run – The Fontainebleau Circuit: An overview of the history and development of Fontainebleau’s coloured circuits. https://rockrun.com/blogs/the-flash-rock-run-blog/the-fontainebleau-circuit-destination-article

Bouldering History – Bouldering History 1.0: A historical overview of the development of bouldering, including early Fontainebleau history. http://www128.pair.com/r3d4k7/Bouldering_History1.0.html

Written in Stone: Climbing History — Bart van Raaij interview — 2026 interview about Van Raaij’s climbing, Bleau.info, guidebooks and interest in Fontainebleau history. Watch the interview on YouTube

The Visionary Appeal of Fontainebleau’s Bouldering Circuits – climbing.com https://www.climbing.com/travel/fontainebleaus-bouldering-circuits

The Fontainebleau Circuit | Destination Article -By Tom Newberry https://rockrun.com/blogs/the-flash-rock-run-blog/the-fontainebleau-circuit-destination-article