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.

Lung capacity is lost faster than muscle.

Oct 23, 2026

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3 min read

Lung capacity is lost faster than muscle.

Two weeks off: here's what actually left, and what didn't.

AJ Cash Cacioppo

They put the vegetable in a pill. It gave people cancer.

Oct 7, 2026

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3 min read

They put the vegetable in a pill. It gave people cancer.

The nutrient in the food is NOT the nutrient in the powder.

AJ Cash Cacioppo

No, the FDA did not just approve BPC-157

Sep 23, 2026

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3 min read

No, the FDA did not just approve BPC-157

The legal status changed last month. The evidence didn't move at all.

AJ Cash Cacioppo

Sep 7, 2026

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3 min read

Reaction time saves lives.

When you trip, maximal strength arrives too late to help.

AJ Cash Cacioppo

Aug 23, 2026

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3 min read

You can't load a bone you don't load

Thirty minutes, twice a week, and heavier than your doctor thinks

AJ Cash Cacioppo

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