# Explain

> https://meetkeely.com/developers/api/explain · Updated 2026-11-06 · Keely, by Metrica Fit LLC

## GET /v1/explain

- **Scope:** none

The topics Keely explains: `recovery`, `hrv`, `resting_hr`, `baselines`, `sleep`, `load`, `zones`, `balance`, `stress` and `workouts`.

## GET /v1/explain/{topic}

- **Scope:** none
- **Path:** `topic`, one of the list’s
- **Errors:** `404 not_found` for an unknown topic

How Keely computes a number, in words and as a formula, with the page that explains it. Show these where you show the numbers, so every number stays explainable.

```json Response
{
  "topic": "load",
  "title": "Load",
  "summary": "Training effort, counted every minute by heart-rate zone and summed since local midnight. …",
  "formula": "HRR = (HR − resting HR) ÷ (max HR − resting HR);  points per minute = clamp(10 × (HRR − 0.45), 0, 5.5);  target = chronic × (0.2 + 0.014 × Recovery) ± 15 %",
  "page": "https://meetkeely.com/load",
  "methodology": "https://meetkeely.com/methodology"
}
```