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Single-variable testing

Test one thing at a time, on and off twice, or you're guessing.

Focus · Device · members

Phenotypic Age

Run Phenotypic Age off a normal blood panel, then fix the worst marker, not the score.

Vitality · Device · members

Cambridge Brain Sciences

Use it to measure your head, never to train it. Practice moves the score, not you.

Focus · Device · members

DEXA

Trust the DEXA bone number. Judge body fat only against your own last scan.

Strength · Device · members

Omega-3 index

Eat the fish. Don't buy the test, and don't chase the number with capsules.

Vitality · Device · members

Full thyroid panel

Test TSH and stop there. Reverse T3 won't explain why you're tired.

Metabolism · Device · members

Fasting insulin and HOMA-IR

Test fasting insulin, and read it against your own last result, not a cut-off.

Metabolism · Device · members

Cuffless continuous blood pressure

Buy a validated arm cuff. Don't let a watch tell you your blood pressure.

Vitality · Device · members

Continuous glucose monitor in non-diabetics

Wear one for a week to learn your meals, then send it back.

Metabolism · Device · members

Garmin watches

Trust the Garmin for your miles. Ignore what it tells you about your sleep.

Recovery · Device · members

Apple Watch

Trust the watch for your pulse. Ignore every calorie it gives you.

Metabolism · Device · members

WHOOP strap

Trust the strap on hours slept. Ignore what it tells you about deep sleep.

Recovery · Device · members