List of Apple Watch Workouts and Metrics
The 12 workout types are:


Cycling (Indoor &amp; Outdoor)
Run (Indoor &amp; Outdoor)
Walk (Indoor &amp; Outdoor)
Swim (Pool &amp; Open Water)
Elliptical
Rower
Stair-Stepper
Other (these can be labeled as various activities like Strength Training, but the label is purely cosmetic—it has no incidence on calorie computations)


The various metrics are:


Duration
Current Pace &amp; Speed
Average Pace &amp; Speed
Distance
Laps
Active Calories
Total Calories
Heart Rate


They are not all available for every workout type. For instance, Pace is available for Run/Walk, while Cycling may show your Speed.

Swims cannot display Current Pace, only Average Pace.

Laps are only available during Pool Swims, whereas stationary machine workouts (such as Elliptical and Indoor Cycling) cannot display Distance-related metrics (eg. Speed).

Pace and Distance calculations for Indoor Walks/Runs are dependent on how well you’ve calibrated your WATCH, and require that you swing your arms throughout the workout. Holding onto the handlebars will cause WATCH to think you are not exercising.

Duration, Active/Total Calories and Heart Rate are available for all workout types.

Calorie computations are calibrated over time, as you wear and use your WATCH. They factor in both your heart rate and the weight you’ve recorded in the Health app.