I don't go as often as I used to but me and a buddy popped in yesterday for a mild work out and this man and woman were there together. I believe they were dating or married. The woman was a good 3 or 4 inches taller than him. They didn't seem to do or act any differently of it was the other way around. It was nice to see this.
There are more taller girl/short guy couples than you think. I'm in NYC and while it isn't something I see every day, I see it often enough to realize that it isn't impossible and that it isn't as uncommon as people would have you think.
I don't go to gyms really. Been to a few with some friends but most "couples" I see in there are either out of shaping trying to lose weight or gym rat couples. Either way, the men are always taller and bigger. haha
I never see this in my area, not that I go to gyms specifically to see it there. But yeah, I either see tall guys with short gals, short guys with short gals, or same height couples.
Not a big gym goer but when I do go (only because it is free and my friends enjoy it) I do see this. There is a couple in their 40's that goes all the time. He has to be around my height and she is 5'9. So only a few inches taller.