A Gym - a place where you go to get in shape, but mostly to look at

a place where you go to get in shape, but mostly to look at hot girls while you do sets and reps

I go to the gym to look at hot girls and not do any actual work.

My friend goes to the gym just to look at hot girls and not do any work.

I told my wife I was going to the gym, but I was just looking at hot girls the whole time.