IT works quite well counting the steps just with the app, for some reason I cannot get my Watch steps to synchronize with Fitbit, I think its a rival company thing, so whenI go for a walk and forget my phon like I did this weekend, MY activity app on the iPhone shows the steps but they don’t get to actifit
I am not sure I would see using your wife’s Fitbit would strictly be cheating, just making use of what’s available LOL