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.

Sep 7, 2026

•

3 min read

Reaction time saves lives.

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

AJ Cash Cacioppo

Aug 23, 2026

•

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

•

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

•

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

•

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

•

2 min read

HTK Field Notes No03

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

AJ Cash Cacioppo