HTK Field Notes

A bi-weekly field journal on performance science, longevity, and human care — no bullshit, no fluff. One study, one take, and what's on the desk. From AJ "Cash" Cacioppo, founder of HTK Method.

Aug 7, 2026

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2 min read

Your wearable made that number up.

Three errors. All pointing in the same direction. Here's how they stack.

AJ Cash Cacioppo

Jul 23, 2026

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2 min read

The invisible expense of a GLP-1

A quarter to half of what comes off isn't fat. And when it comes back, it comes back as the fat you thought you lost.

AJ Cash Cacioppo

Jul 7, 2026

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3 min read

Why "calories in, calories out" is only half true

It's not about willpower. It's about what your body shuts off first.

AJ Cash Cacioppo

Jun 23, 2026

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2 min read

HTK Field Notes No03

The most common question I get, answered honestly for once.

AJ Cash Cacioppo

Jun 7, 2026

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2 min read

The "pump" might be stealing your gains

What 3 minutes of rest does that 1 minute can't.

AJ Cash Cacioppo

Two-thirds of recalled supplements were still on shelves

May 23, 2026

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1 min read

Two-thirds of recalled supplements were still on shelves

And the FDA isn't who you think it is.

AJ Cash Cacioppo