Apple Fitness, Exercise Streaks and Health

I really enjoy exercising. I commit to being active every day. While there are days when my energy levels feel low and exercise feels like the last thing I feel like doing, I always feel better after. I’m also a user of Apple Fitness. And one of the things it does to encourage regular activity is create monthly challenges. And the user community, particularly on Reddit, is into focussing exercise streaks. But are these effective tools?