I know that I have touched on this subject before but I think it is worth revisiting, fitness is an essential part of being a good survivor. those of us who are used to filling up on processed foods are going to have a hard time with the restricted diet that survival or even sustainable farming are going to provide, the change of diet for most everyone is going to be drastic, and the human body, although profoundly adaptable will be hindered by change, going from a surplus calorie diet to a low calorie diet will make you sick, I know this to be true from the time I spent homeless, adapting to a diet of ramen noodles and dumpster food made me violently sick for a number of weeks.
now that we have touched on the point of diet change the next step is the physical form, I think that we can all agree that readiness is the most important and that does not change for the body. A focus on well rounded fitness is crucial both cardio and strength training will help you hike farther, hump a bigger pack, improve your marksmanship (most people don’t take into account the strength it takes to hold a weapon steady for a period of time), allow you to deliver quicker more powerful melee strikes, etc.
being that we are probably not going to have access to a gym of any kind in a survival situation it is important to learn and perfect proper form for body weight exercises (pushups, crunches, pull ups, burpees, leg lifts, flutter kicks, planks, bear crawls, lunges, squats, the list goes on) , and if you plan on sticking to a group you can learn many body on body exercises (using someone else’s body weight to add weight to your squats and whatnot), and remember that good stretching is a very important part of exercise. stay fit and healthy and you will be more apt to handle the extreme changes that the apocalypse brings on.
good luck and stay frosty.