Circadian Rhythm
Your body's internal 24-hour clock that regulates sleep, hunger and energy. Sunlight is its primary signal.
Electrolytes
Minerals — sodium, potassium, magnesium — that regulate fluid balance and nerve function. Lost quickly when switching to a low-carb diet.
Insulin
A hormone that regulates blood sugar. Lower carbohydrate intake leads to lower insulin levels, which triggers fat burning.
Keto Flu
Temporary fatigue, headaches and brain fog that occur when switching to a low-carb or animal-based diet. Usually lasts 1–2 weeks.
Long Run
A slow, easy run done at Zone 2 pace, longer than your typical session. Builds endurance and aerobic capacity.
Nitric Oxide
A molecule produced in the body that widens blood vessels and improves circulation. Brief intense movement triggers its release.
Physiological Sigh
A double inhale through the nose followed by a long exhale. The fastest known way to reduce acute stress.
Strides
Short, controlled accelerations of 20–30 seconds, run at near-sprint effort. Improve running efficiency and leg turnover.
Tempo Run
A sustained run at a comfortably hard pace, typically 20–40 minutes. Builds the ability to sustain effort over time.
VO2 Max
The maximum amount of oxygen your body can use during intense exercise. One of the strongest predictors of long-term health.
Zone 2
A low-intensity cardio pace where you can hold a conversation but feel the effort. Builds the aerobic base that everything else runs on.