algunas respuestas de Nike Support:
Help has arrived. Let's have you try the following steps:
1) Turn Bluetooth 'on' on both devices.
2) Start a run from your phone, and wait for it to mirror on your Apple Watch.
3) Go for a run with just the Apple Watch.
Back on track?
Luego me respondieron:
You can manually add that 10 km run back by pressing the + sign at the top of your activity page. We suggest following the steps we provided for your future runs to get them to sync over. Let us know if any runs from your watch do not sync to your phone.
Les respondi que eso no garantiza la funcionalidad prometida por Apple de poder correr o entrenar sin llevar consigo el iPhone.
You can still run with just the watch. We do suggest you check to see if your phone and watch mirror when the run starts to establish the connection between the devices. This will help the run sync over after you've finished your run. Let us know how that next run works out with this tip
Once you've started your run, you should see the same NRC screen on your watch and phone. That's when you know that the two devices are mirrored.
That's not practical. Must of the time, (and I think mostly people do it that way) I leave home without the iPhone but start running in another place far away from home. For example, if people go to a official half marathon, and doesn't want to carry on the cellphone can't do what you're asking for, because when the run starts you can't have both devices, check that they're mirrored and the leave the cellphone "over there".
I can't believe that this devices and app are not still ready as Apple and Nike said.