I do a lot of LesMills Body combat. How can I add that workout in my Apple Watch 2?

Hi

When recording a workout via the Workout app, choose the activity type that most closely matches your workout. This enables Apple Watch to use the most appropriate sensors and data sources when estimating the results, including using tailored calorie calculations for preset activity types.

For activities that are not included within the list or that are not sufficiently similar - such as martial arts - record your workout under "Other".

This credits one minute of Exercise for each full minute of the workout. Active calories for Other workouts are estimated at a rate equivalent to a brisk walk or based on data recorded by the heart rate sensor, whichever is higher.

Note that tracking can be affected during a workout if your watch loses contact with your skin, causing it to believe that it has been removed from your wrist. A loose fitting band can trigger this by allowing your watch to lift from your wrist and/or by allowing clothing (for example, the end of a sleeve) to slip beneath the back of the watch.

Better contact with your skin may also improve heart rate sensor performance during your workout.

Apple suggests that you consider tightening your band before workouts and loosening it again afterwards.

If your workouts involve flexing your wrists, it may also help to move your watch a little higher up your arm, away from the flexing joint.

More information:

Work out with your Apple Watch - Apple Support