Brian Mackenzie

Brian Mackenzie

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

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