> Documentation index: https://momentum.atlasapps.us/docs/llms.txt
> Canonical page: https://momentum.atlasapps.us/docs/concepts/data-sources-and-missing-data

# Data sources and missing data

Training values are easier to read when you know where they came from.
Check whether a value is a planned target, a Momentum-recorded result,
an imported Apple Health fact, or an estimate. An unavailable value means
the required fact is missing, not that you recorded zero.

## Start with the source

- **Planned work** describes what you intend to do. It is not a record of
  completed training.
- **Momentum-recorded results** describe the workout you recorded in Momentum,
  such as the reps and load you logged. Strength-set duration and distance
  shown in history can retain the targets you entered; they do not confirm
  how long or how far you actually worked.
- **Imported workouts** contain facts read from Apple Health. Their details
  identify the source app or recording device.
- **Estimates** are calculated values, not measurements. The strength
  builder's estimated duration, for example, is not recorded training time.

## Follow a workout into your history

Open a workout on its date in **Plan** to review its details and source.
Apple Health access is optional; it lets Momentum import eligible history
alongside the training you record in Momentum.

An import does not prove that you completed a scheduled workout. Momentum
needs a stable link before it counts the import toward that workout. Unlinked
imports remain separate history, even when they share a date with planned work.
Linked results keep their source attribution.

## Read the gaps as carefully as the numbers

Apple Health access does not guarantee every measurement. A source app or
device may record a workout without heart rate, energy, or a route. Access to
the workout also does not establish access to every associated measurement.

**Partial data** means some facts are available and others are missing. A
summary can use available facts while identifying the missing ones; do not
read it as a complete set of measurements.

An empty reporting period differs from a workout with missing facts. Progress
can show no training recorded, but it does not turn a workout's missing
distance into zero. History may omit a missing metric instead of displaying
an unavailable label. **Completed** does not fill those gaps.

An indoor workout may have no route. When Momentum displays a recorded route,
it includes precise start and finish endpoints rather than masking them for
privacy. Unusable location samples can leave gaps or no displayable route.

## Keep the facts in context

- [Planned and performed values](./planned-and-performed-values.md)
- [Use the weekly Plan calendar](../plan/use-weekly-calendar.md)
- [Set up your Progress dashboard](../progress/set-up-dashboard.md)
- [Feature availability](../reference/feature-availability.md)