I would love a smartwatch that acted as a 2nd display for my phone and controlled things like music and workout apps such as Strava. Then I could get updates on my HR, time, speed, music, location, who's calling me, text messages, etc. without having to dig my phone out. When running I use a waist belt with a water resistant pouch because anything else results in my phone getting drenched in sweat and becoming unusable.