I've worked with a few friends of mine (Jon Carl & Timothy Buck) on the Fitness Totals iOS app. The app aims to simplify viewing sums of your fitness and other activities. We only pull data from the Health app, nothing is stored on any servers.
The whole idea for this app came from my engineer friend Jon Carl when he couldn't find how many miles he had run in the last year. The health app focuses on averages for nearly everything is shows, which is nice, but sometimes you just want to see a total amount!
We wanted the app to be really simple and allow you to see your important totals as widgets as well.
This project is always a work in progress, but you can find the current version on the app store.