the trick is to keep breathing

This sounds like a good plan! I find that guilting or shaming myself over stuff I haven't done just leads to more of not doing it. :( Maybe you could create a short workout you could do at home/in hotel rooms/whatever, so if you lack enough fucks to drag yourself to the gym, or you're traveling, you can still do something. Obviously proper workout/training would be better, but when you only have 15 minutes, it's better to move around a little than not at all. The unfuckyourhabitat approach to fitness!