QT2.0 VO2 Max Block Comments

QT2.0 VO2 Max Block Comments

What This Phase Is Actually About

The VO2 Max training block exists for one specific reason:
your top-end capacity has become the limiter.

By the time we enter this phase, you are typically in a very Aerobic physiological state. Your Critical Power or Critical Speed is occurring at a very high percentage of your power or speed at VOโ‚‚ Max. In other words, your ceiling is too close to your roof.

That sounds good - but it creates a problem.

If the roof canโ€™t move, the ceiling canโ€™t rise.

This block is about creating room again.

1. Muscle Fiber Utilization

Polarized work: roof and foundation

VOโ‚‚ Max blocks are intentionally polarized.

Near the Roof

We do focused work:

  • Above threshold

  • Near VOโ‚‚ Max

  • At intensities that demand full aerobic utilization and recruit higher-force fibers

This work:

  • Trains the body to use Type IIX fibers aerobically

  • Improves oxygen delivery and uptake at very high outputs

  • Pushes directly on the roof of the house

The goal is not anaerobic power for its own sake. Itโ€™s expanding the aerobic contribution of fibers that normally fatigue quickly.

At the Foundation

At the same time, we continue to:

  • Reinforce Type I (slow-twitch) fibers

  • Maintain and slightly expand the foundation of the house

This matters because:

  • A higher roof still needs a foundation that can support it

  • Polarization prevents erosion of durability while intensity rises

This is not random intensity - it is deliberately balanced stress.

2. The Athletic Architecture Model

Lifting the roof so the ceiling can grow

Using the house model:

  • Ceiling = Critical Power / Critical Speed

  • Roof = Power or Speed at VOโ‚‚ Max

When we enter a VOโ‚‚ Max block:

  • The โ€œphysiological atticโ€ is no longer an attic

  • It is closer to a crawlspace

  • And that crawlspace is limiting future gains

At this point, continuing to push threshold work wonโ€™t meaningfully raise Critical Power or Speed. The system has become too efficient relative to its top-end capacity.

So the goal shifts:

  • Apply pressure directly to the roof

  • Lift it upward

  • Restore vertical space so the ceiling has room to move later

This is not about refining efficiency. Itโ€™s about expanding capacity at the top.

3. Quality, Duration, and Fatigue Accumulation

Quality above all else

Because intensity is high:

  • A large portion of training stress comes directly from intensity, not duration

  • Fatigue dulls the very adaptations we are trying to create

So during a VOโ‚‚ Max block:

  • Workout quality is aggressively protected

  • Fatigue accumulation is strictly limited

  • Sessions must be entered fresh enough to push physiological limits

This means:

  • Shorter sessions overall

  • More recovery relative to stress

  • Little tolerance for โ€œjunk fatigueโ€

As a result:

  • CTL growth is modest or flat by design

  • This is not a volume-building phase

  • Progress is measured by capacity, not load

If CTL isnโ€™t rising much here, thatโ€™s not a failure - it is part of the plan.

The Big Picture

The VOโ‚‚ Max block is about reclaiming headroom.

We lift the roof so that:

  • Future threshold work can be effective again

  • Sustainable performance has space to rise

  • The system doesnโ€™t stall at a false ceiling

If Base/Durability builds the foundation, and Build/TH tightens the structure,
VOโ‚‚ Max restores vertical space.

Thatโ€™s its job in QT2.0.