For iPhone 6, 6Plus, 6s, 6s Plus, SE, and Apple Watch 1 & 2
How To Redeem on the Desktop
You must click the "Redeem" link inside of iTunes pictured above.
After clicking "Redeem" you will be prompted to sign in with your Apple ID and your password
How to Redeem on iPHone
How to Install on Apple Watch
To add the Apple Watch Compatibility simply open the Native Apple Watch on your phone and add the RunCadence App to your Apple Watch Apps.