Hello there! I noted some initial observations in another post here https://hive.blog/hive-176853/@potta/some-initial-observations
The apps that I use including another one which posts to the Steem blockchain integrates with Apple Health I believe and if I give full access to Apple Health, it can automatically grab health data including steps which can be more accurate than entering manually. If you could make that work with an iOS app that would be killer!
Also i'm a web dev. If you could use my skills, please let me know!