The gym is indeed a nice place for 'victim-scouting'. I had one right across the street of my office building at my old company...that one was great--during the day you'd see all the other office ladies in the area and the soccer moms staying hot and if you went in the evenings you'd see the younger girls (though I had to keep telling myself that even though they look 'adult'...they're probably high school kids).
I especially like to see them working on useful positions that will serve them well later...
