It does not work
I downloaded the app to my apple watch, and it did not work. It literally did nothing. This app was exactly what I was looking for, so I am greatly disappointed it does not work.
Not enough ratings yet to assess QuarkRun.
QuarkRun : Running Made Simple appears to be a legitimate app. AppsHunter Legitimacy Score for QuarkRun is 90/100.
Based on 90 of 100 points across 7 verification signals from App Store and developer data.