The app uses your location in order to track your mileage, similar to a navigation app like Waze or a rideshare app like Uber. Using location can cause a strain on the battery since these apps need to find your location at least once per minute in order to give you an accurate reading.
One way to reduce strain on your phone's battery would be to close any apps that you aren't actively using. This will give your phone's battery a break!
To help save battery, we also recommend disabling location permissions for the Stride app when you're not using the app. You can do so by going to Settings > Location > App Permissions > Stride, and changing your location setting from "Always allow all the time" or "Always allow" to "Don't allow" when you're not tracking your mileage.
Making improvements to how the app affects battery life is always top-of-mind for us, and we make tweaks to improve battery life in every new version of the app that we release.