How good is the quality of step/distance count on a trendmill who gps isn't involved? It will be my first Apple Watch so I'm unsure about that
You can use the apple watch indoor or outdoor.
If you are jogging outdoor it will use GPS, if you jogging indoor on the treadmill it won't need GPS.
it will give you all the details you need to know regarding step/distance & calories. i bet that's pretty cool right