# Concepts

The terms Dinatos uses. Dinatos is a self-hosted workout tracker: it runs on a server (an "instance") that someone, maybe you, operates.

| Term | Meaning | Who sees it |
|---|---|---|
| **Exercise** | One movement, such as "Romanian deadlift". Most have a tutorial: picture, instructions, target muscles, equipment. | Everyone on the instance |
| **Built-in exercise** | Ships with Dinatos. Cannot be renamed, edited or deleted. | Everyone |
| **Custom exercise** | One you add. You can edit or delete it. | Everyone |
| **Routine** | A reusable plan: exercises with target sets, reps and weight ("Leg day"). | Only you |
| **Activity** | A workout you actually did: exercises with the sets, reps and weight you performed. | Only you |
| **Planned workout** | A routine, or a free-form session, scheduled for a future date. It becomes an activity only when you do it. | Only you |
| **Measurement** | A dated body entry (weight, body composition, tape measurements). Lives in the **Body** tab. | Only you |
| **Instance** | One Dinatos server. The app connects to one at a time. | n/a |

Everything except exercises belongs to one account. On an instance with several accounts, nobody sees anyone else's routines, activities or measurements.

The **Settings** tab holds your account options. It is where you log out, change the server, import and export data, and manage API keys.

See [Using the app](using-the-app.md) for how to use each of these.