Apple Watch
The Watch app installs with Life OS. It shows one list: your readiness, today's list, water, and your ELO.
Heart rate all day
Life OS reads heart rate through the day by default, which is what makes sleep and readiness accurate. You can change this in the Watch app's settings.
Water and tasks
Tap to log a glass, tick things off today's list.
Complications
Add Life OS to a watch face for readiness or today's next item at a glance.