Lap button. Please incorporate a function or feature, where the user can push a lap button to record an interval or certain section of their ride. I understand that you can create your own sessions or choose from workouts where this will automatically occur, however this needs to be a manual function as well. Most importantly include this “button” in the mobile app so that the user can do this remotely from the laptop/pc.
Make sure you vote up the existing request so Zwift knows what the users want: https://support.zwift.com/hc/en-us/search?utf8=%E2%9C%93&query=manual+lap&commit=Search