I ask because for the past three months I thought it'd be a good idea to start running in my vest with my carbine to get some training in.
I try to move at least 3 miles a day, two to three days a week, with nine full AR mags, four full pistol mags, pistol, rifle, and 3L hydration pack. Honestly can't tell if it's been a benefit to my regular regiment or not.
More recently I've been watching rifle class vids, attending rifle classes, and I notice a lot of these folks are not comfortable with the gear, shed it off and get tired, can't handle cold and hot weather very well. And I think a lot of physical training can benefit us all.
After all....how you gonna train to fight if you aren't fit enough to at least stay in the fight. I'm not one of those TEOTWAWKI guys but if you got that mindset, seems like you should be physically and mentally prepared too....not just with weapons, ammo, and food.