In the world of endurance sports, a seductive myth has taken hold: the belief that endless miles of Zone 2 (Z2) training will indefinitely raise your FTP and VO_2 max. This has birthed a new archetype—the Volume Monster. These are athletes stacking 20 to 30 hours a week, often sacrificing their social lives and family time—even sitting on an indoor trainer, convinced that sheer mileage is the ultimate shortcut to elite power.
While there is truth to the “plumbing” benefits of aerobic volume, most athletes eventually fall into a trap where volume stops being a tool and starts becoming an escape.
The Physics of the Ceiling: LT1 vs. FTP
I’ll use my own experience as a case study. As a National Champion, I am capable of massive volume, but I am also intimately familiar with physiological limits. At various points in my career, I’ve pushed my LT1 (Aerobic Threshold) so high that it sat at 85% of my FTP. I hit the point of “aerobic saturation.” My “floor” was practically touching my “ceiling.”
In this specific physiological state, adding more volume at Zone 2 would make me more durable (better at 5-hour races), but it would not make me faster. I was already as efficient as a human can reasonably be.
Think about that. If your “easy” pace is already jammed up against your “threshold” pace, you have run out of room. This is a compressed ceiling. At this stage, more Zone 2 doesn’t increase your fitness; it just pushes you closer to that limit until the fatigue outweighs the benefit. To move forward, you have only two choices:
1. Create Headroom: Raise the ceiling through VO_2 max and Threshold work.
2. Accept Plateau: Keep doing massive amounts of Z2 and wonder why your numbers won’t move.
The Bodybuilder’s Lesson: Precision Over Dogma
Cyclists often ignore the Law of Specificity, but bodybuilders live by it.
• A bodybuilder knows that if 12 reps of a specific weight creates hypertrophy (muscle growth), they don’t just keep doing that same weight forever. They don’t tell themselves they are creating “growth magic” through repetition.
• Once they plateau, they change the stimulus. They move to lower reps and heavier loads to build raw strength, which creates the “headroom” to eventually return to those 12 reps at a new, higher weight.
In cycling, once you move your LT1 to 80-85% of your FTP, you often have to stop focusing on Z2 volume and start focusing on the systems above it. If you increase your time in Zone 2, you are just polishing a floor that is already spotless. You have to move your current Vo2 and your current FTP ceilings.
The VO_2 Max Illusion
Volume Monsters often see a jump in performance when they first start high-mileage programs. They assume it’s the “Zone 2 Magic” moving their threshold. In reality, massive volume can increase your VO_2 max ceiling through sheer cardiac output—essentially “moving the needle” from the bottom up.
However, once you genetically or chronologically reach your ceiling, that progress stops. The athlete then becomes great at riding for five hours at a steady clip, but will be completely “muted” when it comes to race-winning attacks or explosive power. They become masters of maintenance, not progression.
Amateur vs. Professional: The Specificity Gap
We have to stop mimicking WorldTour pros blindly.
• The Pro: Races 1-to-3-week Grand Tours. They need 25+ hour weeks because their event requires that specific durability.
• The Amateur: Races 2-to-4-hour events, 10–20 times a year.
An amateur doing 25 hours of Zone 2 isn’t training like a pro; they are often compensating for a lack of precision. You don’t need 5-hour trainer rides to win a 90-minute crit or a 3-hour road race. You need all zones, a strong lt1 and the Headroom to express a wide range of power outputs.
Year-Round Touchpoints: Preparation vs. Fatigue
There is a common myth that a “big base” allows you to absorb intensity better. Yet, I see Volume Monsters who feel “fried” after only 8 weeks of adding intervals.
Compare that to the athlete who “touches” VO_2 max and Sweet Spot year-round. They aren’t trying to “win” every workout in January, but they keep those systems tuned. When it’s time to build for a race, they don’t shock their system—they simply amplify a system that was never allowed to go dormant.
SmartCyclingLab Takeaways
• Zone 2 builds the plumbing, but Intensity raises the roof.
• If your LT1 is at 80-85% of FTP, stop adding volume and start adding intervals.
• Specificity is a compass, not a phase. Don’t lose your ability to go fast just to prove you can go long.
• Stop “Belief-Based” Training. If your numbers (5min, 20min, 60min power) haven’t moved in years, the Volume Monster has eaten your progress.
Final Thought:
Cycling fitness isn’t measured by how bored you can get riding endlessly slow miles on a bike or trainer indoors. It’s measured by how precisely you can stimulate adaptation. Don’t hide from the hard work in the “ease” of Zone 2. Measure your limits, respect them, and then do the work to move them.
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