How Crux works, and why.
The methods behind the numbers, written so you can check them.
How many calories does climbing burn?
Most figures are about four times too high. Here is why, what the research measured, and how Crux works out its own number.
29 September 2026 · 8 minute read
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How the watch knows you are climbing
Height, movement and rest: what the Apple Watch senses on the wall and how Crux turns it into attempts.
Just climb: a session with no taps
Why the best logging happens after the session, and how review works.
How Beta reads a session
What the coach is given, what it is told never to say, and why it shows its evidence.
What Beta remembers
How a claim made in one session is checked in the next.
Why one app for climbing, training and food
A plan that cannot see yesterday's session is guessing. The case for one logbook.
What the tape means
Colour circuits, grade ranges and why they differ from gym to gym.
Training load for climbers
Seven days against twenty-eight, and how to read the result.
Designing Mist
Why Crux has one accent colour, no gradients and one figure per screen.