To delete the history that's been stored on Google Fit, access its settings
To do that, there is a set of three dots on the upper right-hand corner of the home screen. Select that by tapping on it one time to open up a pop-up menu. The pop-up menu will show us four options. "Add activity", "Log our weight", "Settings", and "Help & feedback".
We want to select the third option, which is "Settings"
We can do this by tapping on it once. This opens up our "profile", including our "Daily goal", "Favorite activities", "Basic information" including "Height" and "Weight", how we are recording our activities and goals under "Units" as well as "Google Fit data".
It will give us a list of our connected apps and devices, which we do not have yet. We still want to delete our history. We can do this by choosing the button at the bottom that says "Delete history" by tapping on it once.