Most Helpful Guy
I pay most attention to the ones who are hottest, regardless of whether it's intentional or they just are. Sometimes a girl there just to workout has a great body or is in a position that looks awesome. Other times a girl has on yoga pants that make her ass look amazing or she's showing some great cleavage or her nipples are hard under a tight top. Bottom line: if she's hot, I'm going to notice.
In general, I can't say I've ever really approached at the gym. I'm there to work out too. I do use the hotties for inspiration to push through the last couple reps though.