Lose output as repeated high-intensity efforts accumulate
Four-week guided challengeA PRACTICAL SYSTEM FOR MAINTAINING OUTPUT WHEN FATIGUE BUILDS
The 4-Week VO2 Max Challenge
Train your ability to keep producing when fatigue, breathing limitations and repeated hard efforts start to pile up.
A four-week guided challenge for serious hybrid and endurance athletes who already train consistently but want to handle demanding efforts with more control.
Complements—not replaces—your existing training.
86.8
Personal performance reference: Chase Stevenson has personally tested at a VO2 max of 86.8. Not a customer promise.
Collegiate hockey
NCAA Division 1 Hockey Captain
Hybrid racing
Hyrox Elite Athlete
01 / The problem
When the effort gets hard, output falls apart.
You can be training consistently, completing your intervals and doing everything your program asks of you, yet still feel your output fall apart when the effort gets hard.
Your breathing changes. Fatigue starts to build. One hard effort runs into the next, and suddenly you are spending more time trying to regain control than focusing on the work in front of you.
More training is not always the answer. Sometimes the missing piece is learning how to respond when the pressure starts to build.
Engine
Aerobic capacity
Driver
Composure + control
Build the capacity. Train the response.
02 / The opportunity
A structured way to work on it
The 4-Week VO2 Max Challenge gives you a structured way to work on that.
Each week, you will focus on a different part of the method, apply it to your training and bring your questions and observations to the live group call.
The goal is not to replace your current training or promise a particular VO2 max score. It is to help you understand your response to hard efforts and make better decisions when fatigue and discomfort increase.
03 / Who it is for
Built for athletes already doing the work.
This is for serious hybrid and endurance athletes, including runners, triathletes, HYROX athletes and strength athletes who train consistently and expect a lot from their bodies. It is especially relevant if you:
Struggle to manage breathing when the pace increases
Feel that fatigue arrives before your effort should be over
Want a structured system instead of adding random extra work
Are willing to follow the process and track what you notice
This is not designed for someone looking for a generic beginner workout plan or a fully individualized daily training program.
This program is intended for adults who are able to participate safely in breath-hold and physical training. Review the safety information and consult a qualified medical professional if you are unsure whether this work is appropriate for you.
04 / What is included
Over four weeks, you will receive:
Four progressive weekly lessons
Practical worksheets and implementation tasks
One live group coaching call each week
Call recordings for every weekly session
Access to the private community during and after the four-week experience
Technical support from Chase and operational support inside the community
Community questions will be answered within 24 hours where possible. Technical questions about the exercises and VO2-related work will be answered by Chase. Logistical questions will be handled by the operator.
05 / Founding cohort
The first live cohort is limited to 20 athletes.
This is the first time The 4-Week VO2 Max Challenge is being delivered live as a structured group experience.
The limit is real because the program includes weekly live group coaching, community support and active observation of participant feedback.
Founding participants receive the complete four-week experience, live calls, recordings, worksheets, lessons and continued access to the program materials after Week 4. They also help shape future improvements through their feedback and implementation experience.
06 / Why Chase
Not built from theory alone.
Chase did not build this from theory alone.
He went from working a desk job to competing at the highest level of HYROX in a relatively short period of time. Along the way, he studied breathwork, worked with experienced breathwork coaches and built his own system around breathing, fatigue and performance under pressure.
His recent race results and verified performance data will be shown here as proof. Personal performance results are not promises of what every participant will achieve.
“I've been wearing my Whoop since 2019, and my resting heart rate was super low, never had been that low, and that was like after the first day of doing it.”
[INSERT VERIFIED TESTIMONIAL 2]
[INSERT VERIFIED DATA OR PERFORMANCE SCREENSHOT]
Individual experiences vary and are not a guarantee of results.
07 / Four-week structure
One focus each week.
Apnea Training
Build the foundation and learn how to approach the work safely and deliberately.
Nervous System Regulation
Learn the geared breath approach and how it fits into the broader method.
Heat Training
Add the next part of the system and understand how to apply it alongside your existing training.
CO2 Tolerance and Zone 2
Bring the method together and understand how this work connects with your aerobic training.
Each week follows the same rhythm: complete the lesson, do the assigned work, track your observations and bring your questions to the live call.
Lesson
Assigned work
Track observations
Live call
MEMBER PORTAL
All four weekly lessons, worksheets, live call details, call recordings, and the private community are organized inside one simple member portal. Start with the current lesson, complete the accompanying worksheet, join the weekly call, and return to the portal whenever you need to review a lesson or recording.
Safety is part of the protocol.
Apnea and breath-hold work must be approached responsibly. Members must review the safety information before participating and follow all environmental and stop instructions.
08 / The offer
The 4-Week VO2 Max Challenge
Four weeks of structured lessons, practical implementation, community support and live group coaching.
- Four progressive weekly lessons
- Practical worksheets and implementation tasks
- One live group coaching call each week
- Call recordings for every weekly session
- Access to the private community during and after the four-week experience
- Technical support from Chase and operational support inside the community
Founding cohort: 20 athletes
$2,000
Investment
Live calls: Sunday evening, with Monday evening used as the fallback where necessary.
09 / Commitment + safety
Built for serious athletes who are willing to do the work.
This is not a shortcut, a magic protocol, or a promise of a specific performance outcome. It is a structured four-week system built around consistent practice, honest tracking, live discussion, and responsible implementation.
When you join, you receive the lessons, worksheets, community access, live group calls, and recordings required to participate in the challenge.
Important safety notice
The apnea work in this program involves controlled breathing and breath-hold exercises, including movement. These practices may cause lightheadedness, dizziness, loss of balance, or fainting.
- Follow the safety instructions before participating
- Have another person present for the first attempt whenever possible
- Use a safe, open, soft, ground-level environment
- Never perform the exercises in or near water
- Never perform them near stairs, ledges, traffic, hard obstacles, machinery, or while driving
- Stop immediately and sit or lie down if dizziness, loss of balance, tunnel vision, fainting, or any concerning symptom occurs
- Consult a physician before participating if you have a cardiovascular condition, seizure disorder, are pregnant, or have another relevant medical condition
This program is not medical advice. Chase Stevenson and The 4-Week VO2 Max Challenge are not providing medical diagnosis or treatment. The final safety, disclaimer, waiver, and legal language must be reviewed and approved by a qualified attorney before launch.
10 / The practice
You already put the work in.
The point of this challenge is to help you get more from that work when the session becomes uncomfortable and your usual response is no longer enough.
You will have a clearer process to follow, a place to bring your questions and four weeks of structured implementation instead of trying to piece everything together on your own.
11 / Questions before you apply
Direct answers. No inflated promises.
12 / Frequently asked questions
The details.
Ready when you are
Train the engine.
Develop the driver.
Apply for the founding cohort of The 4-Week VO2 Max Challenge.
Review the safety information and required acknowledgment before beginning any apnea or breath-hold work.