Measurement methods writer

Lena Hartwell

Lena Hartwell writes for anyone who has looked at a calculator result and thought, wait, why did that change? She likes clean comparisons, plain language, and answers that help you ask the next better question.

The quickest way to win me over

Show me the units, the source, and what changed between two results.

My simple pleasure

Turning a confusing number into one useful next question.

A habit worth keeping

Save the method with the result, so the next comparison still means something.

Guides by Lena Hartwell

Source-backed guides about measurements and the estimates behind them.

5 guides

Measurement

How to take tape measurements

Use the right landmarks for your selected method.

By Lena Hartwell · 3 min read

Methods & limits

Why calculators give different answers

Understand the methods behind the numbers.

By Lena Hartwell · 3 min read

Energy estimates

How to choose an activity level

Include your whole day, not only your workouts.

By Lena Hartwell · 3 min read

Tracking change

How to compare measurements over time

Keep the method consistent and the context visible.

By Lena Hartwell · 3 min read

Body composition

How muscle mass is estimated

See what a waist-based muscle estimate uses and why it is different from lean mass.

By Lena Hartwell · 5 min read