What are the best Fitness apps for iPhone users?

first up, I do not and have no intention of using an Apple Watch. For three years, on a daily basis, I’ve used the fitness app on my iPhone. I get daily step counts, I get daily distances, and I get daily activity data. But nothing ever fills into the trends. Does this only work if I had an Apple Watch? If so maybe I just give up on the app.

[Re-Titled by Moderator]