I need to track cardio with terrain data, but I'd rather not trust Strava with my privacy. I know there are some alternatives, but which one is the most reliable and feature-rich? I don't have smart accessories, just and android phone. Preferably, I'd like an app that let's me track added weights for calorie purposes (like rucking).
Garmin is the best by far. If you read their privacy policy, it's one of the better corporate policies I've read