A very attractive mild acquaintance was either bored or lonely or whatever and set up her own run club, one guy showed up. Without wishing to think like a PUA these are good odds.
Most women like strong looking men and not flyweights.
you'd have a point if half these run clubs weren't full of weightlifters trying to get women by talking to them on a 2-miler
The point is that you need to be lifting weights if you're a man and wanting to attract most women.
It's not rocket science. https://www.youtube.com/watch?v=EWC8_vp-bWI
There was a dating website now-owned by Match Group that did a study years ago (pre-acquisition) that showed that college-educated women preferred guys with runners' physiques by a lot over guys with weight-lifters' physiques, and women without college degrees preferred muscular men by a lot over skinnier guys. In both cases, it wasn't even close. Unfortunately this study was taken down after they got acquired or I would link to it.
others (I.e running) are the equivalent of what food does to get away from predators
Running is how predators in nature catch most of their prey. Strength is not relevant until after they've caught their prey.
I think the "activities" part plays a role. I think a lot of men today struggle with socializing, especially with groups that have a good chunk of women. They feel like they don't belong and are acutely aware of how they can be perceived.
The gym, on the other hand, is a pretty isolated thing.