BiG One

WorkOutDoors is the most advanced and most configurable workout app for the Apple Watch. It's perfect for running, cycling, hiking and any other indoor or outdoor activity.
Note: WorkOutDoors requires an Apple Watch Series 3 or later. It is not necessary to have your iPhone with you during a workout.
WORKOUT HIGHLIGHTS
- 42 different activity types, including all the major activities
- Configure multiple screens with metrics from a pool of over 600 data fields and graphs
- All workouts are saved to Apple's Health system and are viewable in the Health & Fitness apps
- Export workouts as FIT/TCX/GPX files, or automatically upload to Strava (even from the watch)
- Dozens of alert types (e.g. mile/km notifications; high heart rate; low speed; zone changes etc)
- Configure which metrics are displayed and/or spoken for an alert
- GPS signal strength shown before starting a workout, so you can wait for a good signal
- Create your own Interval Schedules: e.g. Warm Up for 5 minutes, Run 5 miles; Cool Down
- Supports Bluetooth sensors for speed, cadence, distance, heart rate & power (including Stryd)
- Zones can be configured for heart rates and also for pace and power metrics
- Associate actions with gestures: e.g. double tap to start a new interval, or to show music controls
- Auto-pause available for many outdoor activities (including Apple's algorithm where available)
- Set a Target Pace and see how far ahead or behind you are (can show a target icon on the map)
- Analyse workouts in great depth on the iPhone app, including detailed lap and interval splits
- Supports watchOS 9 running metrics: power, ground contact time and vertical oscillation (only available on recent models of watch).
MAP HIGHLIGHTS
- Maps can be cached on the watch for use when offline
- Topographic vector map option with configurable contours and hill shading
- Maps can be smoothly panned and zoomed, and can rotate according to the compass
- Map-only mode for when you don't want to start a workout and just need a map
- Uses OpenStreetMap, which includes the trails necessary for outdoor workouts
- Maps cover the whole world. No further purchases or subscriptions required for anything
- A breadcrumb trail of your whole route is displayed on the map during the workout
- A scale is shown on the map when you zoom, making it easy to see the distance to features
- Load GPX routes and display them on top of the map to aid navigation
- Routes are coloured by gradient: from red for steep uphill to blue for steep downhill
- Get alerts when you deviate from or return to the GPX route
- Waypoints in routes are shown as icons (supports "groundspeak" geocache data)
- Shows a red compass pointing north and a green compass pointing to the start
- Tap the green compass to see the distance to the start (double tap a compass to hide it)
- "Smart Contours" use different colours to make it easier to read the terrain at a glance
The app also has many, many more features (far too many to list here!).  
All this is included for a single one-off payment. There are no extra in-app purchases or subscriptions. If you own an Apple Watch and do any form of exercise, then WorkOutDoors is the app for you. Give it a go!