That's worrying. I was looking for resistance band workouts and a friend recommended BodBot. I went to sign up on the app and entered my email address. Then it filled in my age, height, and weight. (All basically accurate to about a decade ago.) WTF? bodbot.com/

And yes, this means you can figure out approximately my height and weight and age, but if you were bored enough I'm sure you could figure it out anyway.