It's like anti-tech.
Strapping large bulky devices to your body for some simple purpose.
You should have a small, light 100 gram GPS watch that can track your calories, workout, play music through bluetooth LE, record your heart-rate, be super rugged like a G Shock, waterproof etc. Afterwards your can upload your data to any site of your choosing, like Strava, Runkeeper or whatever.
You should be able to leave your phone totally behind. Stick your nano-sim in the watch as you're leaving for taking calls/texts - if you want to be really fancy about it (I think the new Gear S can do that).
Apple and sports don't mix unless you turn your ability to reason off and are prepared to make some sort of sacrifice.