I think there's some truth in that. If you're dating you should definitely be putting your best foot forward and part of that means exercising, buying some nice clothes, getting your hair cut etc. When I was dating I also made an effort to work on my "social" presentation. For me that meant trying to take in some relatable media: seeing popular films, reading more widely and just trying to make sure I had topics I could talk about which weren't videogames and sci-fi novels.

I don't think you need to be in the top 5% physically at all. Perhaps if all you want is a hook-up that helps, but I got plenty of dates and I'm now engaged to a woman I met on Tinder and I definitely am not some greek sculpture.