Combined workout

Tap the activities field on top of the screen to show all available Activities. For combined workouts select an activity from one of the Workout sections:

Activities view

Add the start date and duration of your workout - you can also add the distance covered and energy burned for your selected activity or just leave these fields empty and tap Record:

Combined workout

Your workout is saved in Workout Records and your iOS Health App in Health Data > Activity > Workouts:

Workout in Health App

By default Workout Records will show your workouts for the past 7 days. To list previous records, tap show more:

Workout in Workout Records