I go to the gym fellas as I'm sure all you do and once you are there long enough you get to know people that come in on a regular basis. It should be the easiest place to take a girl on a date and get laid. Here's how.

Act like you are giving her a training session but give her some agency. If she's fit enough, focus on leg and lower back exercises. Squats, good-mornings, leg press... She likely has never done these before.

Now, after you've given her a good workout, it's time to go back to your place. There's two ways to go about this. You can tell her beforehand that you'll help her workout if she cooks dinner (like a good woman should) or you can avoid the proposition altogether and cook the damn dinner yourself. Afterwards, pop in a movie, commence sex.

You're welcome. : D