Here you go guys they both work

1-Walk by smiling, and stop and say "your doing that wrong" and then just keep walking

Everyone else is playing personal trainer, play knowledge and you noticed but don't give a shit.

2- When guys are playing personal trainer set up your next exercise next to her with your headphones on, and the next time a guy does his personal training thing Look straight at her and laugh, take one ear piece out and say women are always telling me how to train too. Then put your ear piece back in and go about your exercise.

She will not be sure if your funny, being understanding of her plight?? She will recognize that you are confident, in a place where guys feel threatened by the pound (flesh and Iron). She will also see that you recognize what she is going through and you feel just as good about yourself to make a crack at her expense.

A serious person (male or female) training will stay covered up and keep their head sets on, they are using the lack of exposure and the music as a way not to compare themselves to others and to focus. If they are exposing themselves or dressed to display they are looking to feed the inner need for attention. I walked in the gym 170 lbs / 4% body fat/ 6' tall, and walked out 6 year later 280 lbs 10% body fat and I watched all the guys with careers and their personal life together take the 10's, and the broken women stuck to the big guys for daddy issues.

A fit guy dressed clean vs a guy who spends his last dollar on sauce will win the battle. Women are just as intimidated by Bodybuilders as Men are by 10's. The women that seek out the bodybuilders are generally the strippers (physical security issues) and they make the money so its a whole different set of rules.

OK i really like where you're going with this, and it really seems like a profound way to open, but even if you get their attention, how do you escalate, and number close? Is this enough, or by getting their attention, you just have to hope that you will see them again at a later date and then go from there?

They tend to initiat conversation after you blow them off. Their ego will drive them to get your interest, so slow your roll and do your exercise. When they take their ear piece out you know they wanna talk. Make it short because you are busy training "Right!" Say hey I'd like to talk more but I need to keep my focus, I tell you what give me your number and ( what ever you feel comfortable with negotiate).
The gym is about feeling good about yourself, so exude confidence.