Id say analyze the data using ai from like Fitbit or whatever else, primarily the best would be to use Google health connect
I also want to be able to like track location like specific location like my drive location when I get there and one ice leave and it just attracts that
Then another thing is being able to compare said Data similar to metriport If you can make your app as close to what that app already does then you have a solid app but then adding in the ability to get information from but load of apps using health connect will be brilliant!