Well first, are you one of the most in shape guys there?
Gyms are a good place to pick up women if you are one of the most in shape, aesthetically appealing guys in there because women will clearly see you as the catch.
But if you look like a regular motherfucker, and a motherfucker that looks like Prime Arnold regularly goes there, you gonna have an uphill battle because she seen what she can get.
There's about 8 bodybuilder dudes that goes to my LA Fitness and they know all the attractive women regulars. They got the gym on lock.
When I was young and bagged women at the gym I used to wear gym bro hoe shit. I would wear skimpy ass muscle tank tops. Tight ass shorts.
Sometimes I would do cardio with my shirt off.
I was advertising bruh.