Questions, answered.
Everything you need to know about the tests, prep, and the studio.
Why is VO₂ max worth measuring?
VO₂ max is the single best-validated predictor of all-cause mortality and aerobic performance — a bigger one than smoking status, cholesterol, or blood pressure. Practically: it sets the ceiling on every endurance effort you do, and the heart-rate zones derived from your test turn every workout from guesswork into a prescription. Most people walk in curious and walk out with a 90-day training plan.
Why measure RMR instead of using an online calorie calculator?
Online calculators (Mifflin-St Jeor, Harris-Benedict) estimate from height/weight/age and miss the actual person by 10–25%. A measured RMR puts your real number on paper — useful if you've been stuck on a weight goal, eating less and less without progress, or wondering whether you're actually under-fueling. The test is 20 minutes of sitting still, and the result rewrites your daily calorie target with confidence.
How accurate are the results compared to my watch?
A measured test is ±2–3% — Korr CardioCoach metabolic analyzer, breath-by-breath gas exchange, the same protocol used in research labs. An Apple Watch or Garmin estimates VO₂ max from heart rate and pace alone and is typically off by 15–20%. Wearables are great for trends; they're not accurate enough to set training zones from. We use the watch number to confirm the lab number is plausible — not the other way around.
Will I actually know what to do with my results?
Yes — that's the entire point of the report. You leave with: your VO₂ max number with a percentile, your fitness age, ventilatory thresholds (VT1 / VT2), five heart-rate training zones loaded for any watch or app, and a same-day debrief explaining what each number means and what to change in training to move it. If you're working with a coach, the report drops directly into their plan.
How long does the test take?
About 45–60 minutes door to door for VO₂ max, 20–30 minutes for RMR, or 90 minutes for the full assessment if you're doing both. The test itself (the part that's hard) is 10–15 minutes. The rest is setup, warm-up, cool-down, and reviewing your numbers.
How should I prepare?
For VO₂ max: fast for 3–4 hours, no caffeine for 4 hours, no hard workout in the previous 24 hours, sleep well, hydrate normally. For RMR: fast for 4–5 hours, no caffeine and no exercise on the day of testing. Wear athletic clothes you can sweat in and bring water. Detailed prep lands in your confirmation email.
Can I do both VO₂ max and RMR in one visit?
Yes — that's the Performance Pack ($300, save $25). RMR runs first while you're rested, then VO₂ max. Plan ~90 minutes total. Most people prefer this because the prep overlaps and you walk away with the complete metabolic picture in one trip.
How soon will my number actually change?
VO₂ max responds to targeted zone-2 and threshold work within 8–12 weeks for most clients — gains of 3–8% are typical for that window, more if you're starting from sedentary. We recommend retesting every 8–12 weeks if you're actively training, or every 6 months for general progress tracking. The first retest is usually the most rewarding.
Will I get too exhausted?
The hardest part of a VO₂ max test lasts only a few minutes. The protocol starts easy and ramps up gradually, and you control when to stop — we end the test the moment you signal you're done. Most people feel like they pushed hard for the last 2–3 minutes, then recover fully within 10. You'll be tired, not wrecked, and you can drive home and eat normally afterward.
Do I need to be an athlete?
No. Roughly half the people we test are everyday adults — people starting a fitness routine, managing weight, training for a first 5K, or just curious about their numbers. The test ramps from a comfortable walk and ends whenever you've reached your personal limit. There is no minimum fitness level, and your zones are calculated from your data, not compared to anyone else's.
What happens if my results are bad?
There is no pass or fail. A lower-than-expected VO₂ max simply means there's a clear baseline to improve from — and VO₂ max is one of the most trainable numbers in physiology. We walk you through what the result means, what's normal for your age and sex, and exactly which training zones will move it. Most clients see measurable gains within 8–12 weeks of targeted training.
Is this the same as what elite athletes do?
Yes. We use the same breath-by-breath gas-exchange method (Korr CardioCoach metabolic analyzer) and the same VT1/VT2 ventilatory threshold analysis used in university exercise physiology labs and pro team performance centers. The protocol, the data, and the training zones we hand back are identical to what an Olympic-level coach would work from — the difference is the setting and the price, not the science.
Is $250 worth it?
Most people compare it to two things. First, your watch: an Apple Watch or Garmin estimates VO₂ max within roughly ±15–20% from heart rate alone — fine for a trend, useless for actual training zones. A measured test is ±2–3%. Second, a gym membership: $250 is about two months of a typical gym, and the training zones you walk out with are good for the next 8–12 weeks of every workout you do. For comparison, hospital exercise physiology labs charge $400–$800 for the same protocol because you're paying for cardiology oversight and facility fees built for diagnostics. Pricing here is flat — no surprise charges, no insurance back-and-forth.
Why come here instead of driving to a hospital lab?
Most Bay Area hospital labs require a physician referral, schedule weeks out, and return results days later through a patient portal. We're walk-in-bookable in Santa Cruz, usually within the week, and you leave the same day with a full report, your VT1/VT2 thresholds, and five training zones ready to load into your watch or app. You also get a real conversation about the numbers with someone whose job is performance, not diagnostics — and you skip the drive over the hill.
Do you accept insurance?
We don't bill insurance directly, but we can hand you an itemized receipt to submit for reimbursement if your plan covers fitness assessments or metabolic testing. HSA and FSA cards generally work at checkout. Pricing is flat — no surprise charges, no clinic billing.