This makes me laugh because when I was a teenager they were usually so...ooky!! ! Around 18 or so that started to change and I guess I just started seeing things differently. There are still the frumpy ones, who can't be helped by a uniform, but yeah, there are some very fit ones around these days. I wondered the same thing about fitness requirements.
One time when I lived in NYC, I was walking down 5th avenue when a cop, standing in a whole group of them, leaning against a building, said to me "smile". Usually I find this so invasive, but there was something about him and my mood and I just went with it. I looked at him, very quickly up and down, then right in the eyes and smiled a sexy smile right at him. He seemed a little pleasantly caught off guard and smiled back. It was a nice encounter.