Why swimming's good for you

And here I am thinking swimming was already an excellent way to spend the evening. Well, just found another good reason! Tonight, Ziena and I encountered a really goodlooking guy in our local swimming pool. So, I swam past him, and he said Hi to me with a big smile on his face, even though I haven't ever seen him before (at least, I can't remember). So, later on, after swimming, I'm waiting in the hall for Ziena after getting dressed, so he walks by, and again greets me with a big smile.

So what can this mean? Either I'm extremely stupid and we know each other from somewhere, or maybe he likes me? Without knowing me? I have to say, he was really goodlooking and had a lovely smile! I'll be sure to go back next Wednesday (as well as Tuesday and Thursday).