Brian Mackenzie

Brian Mackenzie

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Human performance coach; breathwork and stress physiology; co‑founder Shift Adapt.

Neglected Coordination Increases Injuries; Targeted Work Cuts Risk 72%
SocialApr 24, 2026

Neglected Coordination Increases Injuries; Targeted Work Cuts Risk 72%

Balance & Coordination Limitations → Injury Amplification in Compensation Loops This loop/trap — is built through years of reinforced poor movement. This was the big thing I saw with endurance athletes 20yrs ago. Neuromuscular injury prevention demonstrates that high adherence to...

By Brian Mackenzie
Aerobic Limits Trigger Chain of Metabolic and Mental Decline
SocialApr 23, 2026

Aerobic Limits Trigger Chain of Metabolic and Mental Decline

Behavioral constraints are directly correlated with aerobic limitation. The aerobic limiter isn't just about endurance, as it cascades with almost all other limiters. Behavior can work on either end of this, too. Aerobic limitation → Mitochondrial limitation → Cellular energy...

By Brian Mackenzie
Intensity Rebels Miss Gains: Embrace Boring LISS
SocialApr 22, 2026

Intensity Rebels Miss Gains: Embrace Boring LISS

"The Anti-Establishment Athlete" & The Intensity Trap This is the ironic one. The deviant often ends up in glycolytic hell precisely because they rejected the mainstream advice to "just do cardio." They went hard and intensely because everyone else was doing...

By Brian Mackenzie
Break the Glycolytic Trap with Bulletproof, Data‑Driven Rules
SocialApr 22, 2026

Break the Glycolytic Trap with Bulletproof, Data‑Driven Rules

"The Rule-Follower" & The Intensity (glycolytic) Trap Somebody "they trusted" — a coach, a program, an influencer, a culture — told them this was the answer. They didn't knowingly choose the glycolytic trap; they inherited it through conformity. And once they're...

By Brian Mackenzie
Chronic Stress Undermines Diet and Exercise Benefits
SocialApr 21, 2026

Chronic Stress Undermines Diet and Exercise Benefits

People who are chronically stressed are more susceptible to food and exercise related issues. Psychoneuroimmunology research shows chronic psychological stress dysregulates the immune response in atopic (allergic) conditions. The number of people who change their diets, but not how they...

By Brian Mackenzie
Community, Not Adrenaline, Drives Fitness Class Loyalty
SocialApr 21, 2026

Community, Not Adrenaline, Drives Fitness Class Loyalty

The SOCIAL Glycolytic Trap — "The Class Regular" Glycolytic training happens in groups; it's the only way to SELL the class model beyond long-term gain. The 6 am class. The bootcamp. The CrossFit box (I've run 4). The community is the...

By Brian Mackenzie
Turn Aerobic Base Work Into Novel Experiments
SocialApr 21, 2026

Turn Aerobic Base Work Into Novel Experiments

The Glycolytic Trap & “The Variety Junkie” Low-intensity aerobic work is the most predictable, repetitive training there is. This nervous system is destabilized at the thought of LISS as it feels like a slow death. They gravitate to glycolytic training...

By Brian Mackenzie
Pressing Tongue to Roof Boosts Strength and Sleep
SocialApr 21, 2026

Pressing Tongue to Roof Boosts Strength and Sleep

Tongue exercises (eg opening mouth and slowly circling rim of mouth 5-10x, or pressing tongue from tip snaking to the back to roof of mouth 10-20x) daily we’ve seen change sleep and mechanics.

By Brian Mackenzie
Aerobic Limits Drive Identity‑Driven Burn Pursuit
SocialApr 15, 2026

Aerobic Limits Drive Identity‑Driven Burn Pursuit

The aerobically limited athlete will be state dependent on chasing the burn (pH)/glycogen/>SNS/hormones. They will be psychologically tied to an identity that isn’t doing enough. Their nervous system will literally protect and chase this state.

By Brian Mackenzie
Adaptations Fail Without Required Behavioral Change
SocialMar 27, 2026

Adaptations Fail Without Required Behavioral Change

When we get outcomes (adaptations) that require behavior modification (work), without the behavior modification we build change on top of dysfunction. The nervous system is still compensating. The root problem continues to fester. This is well understood in human performance....

By Brian Mackenzie