Privacy Policy

The short version

• Trailhead reads your weight, body fat and height from Health Connect so it can show how they change as you train. It only reads them. It never writes or changes them.
• If you switch it on, Trailhead saves each guided workout you finish to Health Connect as an exercise session. It is off until you turn it on.
• Your programme progress is stored on your phone, and only there. You can save a backup of it to a file you choose, and restore from it. Trailhead never sends that file anywhere.
• Trailhead only uses the internet if you turn on Check for new programmes. It is off until you do. It then reads a public list of programmes and downloads programmes when you ask, and sends nothing about you or your progress.
• Nothing is sold, shared or used for advertising.

Where each record type goes

A record-by-record account of what Trailhead touches in Health Connect:

* Only if you turn on Save to Health Connect before a workout. Trailhead never changes your weight, body fat or height — those three are read-only, always.

What Trailhead reads from Health Connect

With your permission, Trailhead reads three things: your weight, your body fat percentage and your height. It does not read anything else, such as heart rate, sleep or location.

Trailhead also asks to read past Health Connect data. Without that, Android only lets an app see records from the 30 days before you first allowed it, which can hide a height you recorded months ago — in Cairn, for instance.

These readings show your starting point, save a before-and-after snapshot when you begin a programme, finish each phase and finish the programme, and show how they've changed on the Progress screen. Nothing else. You can stop this at any time in Health Connect by removing Trailhead's permissions; Trailhead keeps working without them, you just won't see body measurements.

What Trailhead writes to Health Connect

Trailhead can save the guided workouts you do to Health Connect as exercise sessions. This is off by default, and only starts if you turn on Save to Health Connect before a workout.

Each saved session has the workout's name, its start and end time, a type such as strength training or calisthenics, and a short note of which programme and session it was and how many exercises you finished. Nothing else is written, and Trailhead never changes your weight, body fat or height.

Once a session is in Health Connect it belongs to Health Connect and to you. Other apps you've allowed to read exercise data can see it. You can delete it in Health Connect at any time, and removing Trailhead does not delete it.

Backing up your progress

Trailhead is left out of Android's cloud backup on purpose, so reinstalling or setting up a new phone from scratch would normally lose your progress. Open Settings (the cog at the top of the home screen), tap Back up, and choose where to save the file, for example Downloads or your Drive. To bring it back, tap Restore and pick that file.

The backup file contains your programme runs, the sessions you marked done or skipped, and your body-measurement snapshots — not your settings. It's plain text and is not encrypted, so keep it somewhere private.

Trailhead only writes the file when you ask, only to the place you choose, and never sends it anywhere. Restoring replaces what's in Trailhead with what's in the file, and asks you to confirm first.

Checking for new programmes

Trailhead comes with a few programmes. More are published at trailhead.clivewalkden.co.uk, hosted by Cloudflare, and Trailhead can check that site for new and updated programmes and download them. This is off until you turn it on, from the question on the home screen or the switch in Settings, and you can turn it off again at any time.

When it's on, Trailhead reads a list of programmes when you open the app, at most once a day, and when you tap Check now. It downloads a programme only when you ask. Everything it downloads is checked first: the list is digitally signed, and a file that doesn't match its signature or fingerprint is thrown away.

Stored on your phone: the programmes you download, a note of when Trailhead last checked, and which new programmes you've dismissed. Turn the setting off and Trailhead stops connecting; programmes already downloaded stay until you clear Trailhead's storage or uninstall it.

What Trailhead stores on your phone

• Which programme you're doing and when you started it
• Each session you mark as done or skip, and each phase decision to move on or repeat a week
• The body-measurement snapshots described above
• Your settings: reminders, saving workouts to Health Connect, checking for new programmes
• Programmes you've downloaded, and which new ones you've dismissed

All of it stays in the app's private storage, is not sent anywhere, and is excluded from Android's cloud backup. A direct phone-to-phone transfer can carry it to a new device.

Notifications

If you switch on reminders, Trailhead shows a notification on your training days at the time you choose, created on your phone by an alarm on your phone. Its buttons, Mark done and Not today, only update the progress stored on your phone.

What Trailhead does not do

• No account or sign-in
• No internet use unless you turn on Check for new programmes, and then only to fetch programmes — never your progress, measurements, settings or backup files
• No advertising, analytics or crash-reporting tools
• No selling or sharing your information, and no using it to show you adverts

Permissions Trailhead asks for

Your choices and deleting your data

• Reminders can be switched off in Trailhead at any time.
• Internet use stops as soon as you switch off Check for new programmes in Settings.
• Measurements and saved workouts stop if you remove Trailhead's permissions in Health Connect, or switch off Save to Health Connect in the app.
• Deleting everything Trailhead has stored: clear its storage in your phone's settings, or uninstall it. This doesn't delete any backup file you made.
• Your weight, body fat and height records belong to Health Connect and to you — Trailhead never changes them, and removing Trailhead doesn't delete them. Workouts it saved to Health Connect stay there until you delete them yourself.

Health information

Trailhead is not medical advice. Check with a doctor or other health professional before starting a new exercise programme, particularly if you have a health condition, an injury, or you're unsure whether exercise is right for you. Stop and seek advice if you feel pain or unwell.

Children's privacy

Trailhead is not designed for children under 13.

Changes to this policy

If Trailhead ever changes in a way that affects your privacy, this policy will be updated first and the date above will change. Trailhead will not start collecting or sending information without telling you here.