I bought a shotgun, and once a month aim to do a gunnery drill for 150 shells. It is exhausting and expensive, but should be a good benchmark for the results of my swimming exercises: About an hour and a half of water weights, walking, and swimming. Probably another 20 minutes in the steam and hot rooms. Figure I need enough strength and endurance to patrol and wield a rifle.
If there is a 2nd American Civil War, the good guys will need infantry, and I intend to be part of the ranks. I won't excel, but at least it frees up skilled people to hack, drone, or spy on the MAGATs.