CO₂ Tactics — Free Assessment

Measure Your
Stress Capacity
In 60 Seconds.

Most athletes train their skills. Few train their ability to access them under pressure. The BOLT test reveals exactly where you stand.

Free · No signup required · Takes 60 seconds

The BOLT Test

How to Perform the Test

The Body Oxygen Level Test (BOLT) measures your CO₂ tolerance — the foundation of stress capacity. Follow these steps exactly.

01
Breathe In

Take a normal, relaxed breath in through your nose. Do not take a big or exaggerated breath.

02
Breathe Out

Take a normal, relaxed breath out through your nose. Let it be completely natural — no forcing.

03
Pinch & Start

Pinch your nose closed with your fingers and immediately start a timer on your phone.

04
Hold & Wait

Hold until you feel the first definite desire to breathe — not maximum discomfort. Stop there.

05
Record Score

Stop the timer and record your score in seconds. That number is your BOLT score.

Do not take a big breath before the test — this inflates your score artificially.

Do not push to maximum discomfort — stop at the first genuine urge to breathe.

Return to calm nasal breathing immediately afterward. If you gasp, you held too long.

Your Results

Enter Your BOLT Score

Input the number of seconds you held before the first desire to breathe.

BOLT Score
SEC

Enter a number between 1 and 120

Your Assessment

Your Results

Score Reference

Understanding Your Zone

The BOLT score directly reflects your CO₂ tolerance — and your capacity to perform under pressure.

0–10
Red Zone
Reactive

High physiological reactivity to stress. Breathing patterns under pressure are significantly compromised.

11–25
Yellow Zone
Developing

Some stress capacity present but performance suffers under moderate to high pressure situations.

26–40
Green Zone
Resilient

Developing strong stress resilience. Composure is improving and skill access under pressure is growing.

41+
Elite Zone
Elite

Excellent stress capacity and physiological control. The foundation for performing at the highest level.

Coaches & Directors

Run a Roster?

Every roster has him — the best player in practice, gone when it counts. More reps won't fix it. Fifteen minutes with James and Matt and you'll see the number behind it, and how to train it across your whole roster.

For coaches and program staff · Zoom

Built By Athletes

Built By Former
Major League Players

James Jones
James Jones
Former MLB Outfielder · Seattle Mariners
Co-Founder · CO₂ Tactics

James reached the majors as a center fielder with the Seattle Mariners, part of fifteen professional seasons that also took him through the Los Angeles Dodgers organization. An outfielder's career is long stretches of stillness broken by moments that demand everything at once — that gap between waiting and executing is where pressure does its damage.

MLB
Career Level
1
MLB Teams
15
Pro Seasons
Matt Magill
Matt Magill
Former MLB Pitcher · Dodgers, Reds, Twins, Mariners
Co-Founder · CO₂ Tactics

Matt pitched in the majors for the Dodgers, Reds, Twins, and Mariners over a fifteen-season professional career — every outing a chain of isolated, fully exposed decisions on the mound. He knows from the inside what separates how an arm works in the bullpen from how it works with the game on the line.

MLB
Career Level
4
MLB Teams
15
Pro Seasons