I'm not saying they're completely independent of each other, but given the choice I have more respect for someone who stands up for what they believe in than someone who is ripped and cucks out. And I have seen both these extremes, it's not the norm, but it does happen. I wouldn't date someone who doesn't care for their own physical wellbeing either, but I'll always respect them if they show they can stand up to the herd.

Of course being physically weak isn't good, you should always strive to be healthy and able to defend yourself (although that goes beyond mere strength alone, after all muscles won't make you impervious to knives or broken bottles).