Coaching practices for Aerobic Anaerobic Crossover

Describe almost anything you are working through and IX Coach finds the practices whose real-world fit is closest. For Aerobic Anaerobic Crossover, these are the strongest matches in the current practice library.

Does this sound like the set of challenges you might be facing?

• Everyone keeps telling me to train in "zone 2," but without a lab or a monitor I have no idea where my own line actually is
• When I stop after a hard effort I’m doubled over gasping through my mouth, and it takes forever for my heart to settle
• Most of my training lands in that comfortably-hard middle gear, and I leave every session tired but my fitness barely moves
• I’ve already been building breath tolerance for weeks and the easy stuff feels too easy now
• There’s a pace I can hold comfortably and then a wall I hit fast where my legs flood and I have to back off, and that wall hasn’t moved in ages

Practices that may help

1. Find your aerobic–anaerobic crossover with the talk test
   The moment comfortable speech breaks down marks your first ventilatory threshold — the ceiling of sustainable aerobic work.
   The Talk Test: Gauge Exercise Intensity Without a Monitor
2. Recover through the nose after exercise
   Close your mouth within 30 seconds of stopping exercise — however uncomfortable — to accelerate HRV recovery.
   The Oxygen Advantage, Made Practical
3. Polarized training distribution for sustainable VO2 max gains
   Spend 80 % of training time in Zone 2 and 20 % in Zone 4–5 — the combination elite endurance athletes and longevity-focused medicine both support.
   VO2 Max and Longevity: Training Your Aerobic Ceiling
4. Advanced breath holds — MHT (max hold training)
   Build CO2 and O2 tolerance with progressive maximum breath holds — used by elite freedivers and now applied to sport.
   The Oxygen Advantage, Made Practical
5. Lactate threshold training
   Train at the intensity just below where lactate spikes to push your sustainable pace higher.
   VO2 Max and Longevity: The Peter Attia Framework
6. Staircase sprints as a cardiovascular exercise snack
   Three 20-second all-out stair climbs, three times a day, measurably improves aerobic capacity.
   Exercise Snacks: Short Bursts of Movement That Actually Work
7. Build a zone 2 aerobic base
   Log 3–4 hours per week of low-intensity aerobic exercise to develop mitochondrial density and fat-oxidation capacity.
   VO2 Max and Longevity: The Peter Attia Framework
8. The Oxygen Advantage, Made Practical
   The Oxygen Advantage is Patrick McKeown’s framework for improving athletic and cognitive performance by increasing CO2 tolerance and optimizing breathing mechanics through nasal breathing, breath holds, and simulated altitude training. The underlying physiology (Bohr effect, CO2 chemosensitivity) is well established; specific protocol outcomes in trained athletes have promising but limited RCT support.
9. Pair zone 2 with occasional high-intensity work in an 80/20 polarized structure
   Most training volume in zone 2, a small fraction at near-maximal intensity — skip the moderate middle.
   Zone 2 Training
10. VO2 max intervals (Zone 4–5) to push your aerobic ceiling
    Four-minute intervals at near-maximal effort, repeated 4–6 times, are the most efficient way to raise your VO2 max.
    VO2 Max and Longevity: Training Your Aerobic Ceiling

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