Performance & Growth
Hypertrophy, strength, work capacity, and the biology of getting better.

Heart Rate Variability: What It Measures and What It Misses
HRV is one of the most useful — and most misinterpreted — recovery metrics available. Here is a comprehensive look at what it measures, what it does not, and how to actually use it.

Heart Rate Variability: The Physiology of the Autonomic Stress Signal
HRV is one of the most useful — and most misinterpreted — recovery metrics available. Here is a comprehensive look at what it measures, what it does not, and how to actually use it.

Creatine Beyond the Gym: Cognitive and Cellular Energy Research
Creatine is one of the most studied compounds in nutrition science, and its most interesting effects are not muscular. Here is a comprehensive look at the cognitive, neurological, and cellular-energy research.

The Hypertrophy Equation: Stimulus, Recovery, and the Missing Middle
Hypertrophy is not just training hard. It is the balance between mechanical stimulus and recovery capacity — and most programs get the middle wrong. Here is what the evidence supports.

Zone 2 Training: Why the Aerobic Base Is the Real Performance Cheat Code
Zone 2 has become the most-hyped training concept of the decade. Here is a comprehensive look at what it actually is, why the aerobic base matters, and how to train it without over-complicating the protocol.
Other research categories
Get new performance & growth research each week.
Weekly dispatches, plus the free 30 Peptides Codex when you subscribe.