Hormones, Training and Recovery

CHAPTER 15

Testosterone, cortisol, thyroid, and growth hormone physiology without unscientific booster claims.

Module: 15of 30
Read time: 15min
Access: Fulledition
Status: Newunread

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What you will learn in this chapter

Testosterone, cortisol, thyroid, and growth hormone physiology without unscientific booster claims.

Key Topics Covered

The Four Hormones That Matter Most
Sleep Is The Hormonal Master Variable
Body Fat, Both Directions
What Actually Moves The Needle
Reference Ranges Worth Knowing
Execution Checklist
Sources and reading notes

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Hormones, Training and Recovery

By Omar AbdohUpdated 24 September 2026

What this chapter covers

Hormones do not make decisions for you. They set the terrain on which your decisions play out.

The supplement industry sells this chapter's topic harder than any other, because hormones are invisible, powerful sounding, and impossible for a customer to verify. "Boost your testosterone naturally" is one of the most profitable sentences ever written.

In this chapter

The Four Hormones That Matter Most

Sleep Is The Hormonal Master Variable

Body Fat, Both Directions

What Actually Moves The Needle

Reference Ranges Worth Knowing

Execution Checklist

Sources and reading notes

This book is educational and is not medical advice. It cannot account for your medical history, medication or injuries. Speak to a qualified clinician before changing how you eat or train, particularly if you are pregnant, managing a health condition, or returning from injury.