My sibling and I bought our mum an Apple Watch for her birthday, so I can feel your pain. Thing is, it seems to have worked. She has started going on longer walks, and loves to share photographs of her watch screen workout reports on our family whatsapp group. Nevertheless, on balance, I'm a strong proponent of fitness trackers but NOT of the Apple Watch variety. I bought a used Garmin fitness tracker with a heartrate monitor, GPS and a crap, low-res screen.
It has been worth its weight in gold.
It tracks my cadence while I'm running (I run with a metronome at 180 bpm to facilitate barefoot running and to be gentle on my knees). It tracks and maps my runs, so I can SEE my progress and that motivates me. And the fact that it has a crap screen means the battery life lasts long. On a recent 10 day hike, I would charge it while I ate dinner, and then the next day it would track everywhere I went. Coming back home, I was able to plot my hike on Google earth, and it is *fantastic* to look back on. You can even buy black and white watches for serious ultrarunning etc, which last even longer.
Apple watch and its ilk seem to be focussed on trying to recreate a "phone for your wrist" thing, which is inefficient in my opinion. I turn off all notifications, calendar, sleep tracking, email and all that crap and just use it as a fitness thing.