Compared with men throughout all of history we live lives of extreme comfort. It's important to challenge yourself and discipline your body, as it also discipline your mind. Turn the heat down in your house. Take off those weightlifting gloves sometimes. Make things less conveniently comfortable for yourself in simple ways that aren't harmful. Go make a point to spend an entire day outside hiking off-trail in the snow and see how you do. As a whole we are soft as fuck. Be less soft. Even the tiniest difference could make the difference between life and death in a society-ending scenario. Enduring pain and doing it gracefully and with purpose is very important. Edit: also discipline your wife's body if you know what I mean. They like it.