Pendio started as a tool for my own training. The numbers I had told me how far and how high I’d gone, but not what the ground had asked of my legs: how much of a long run was steep descent, or how a big week compared with the course I was aiming for. So I built something that reads every climb and descent and turns them into numbers that describe the terrain.
Here I write about what those numbers mean, using published race courses and made-up examples, never anyone’s training data. If you spot a mistake, write to hello@pendio.app.