As a retired LE officer, we spent many hours on the range, no matter the weather, and many times, we conducted 20-30 min. of physical fitness training to get our heart rates up and the sweat flowing before we shot.
It can and does make a huge difference. It was miserable trying to control your breathing, steady your hands, and control the sweat running in your eyes, and still make good groups.
Often, after we somewhat recovered, we were told to holster our weapons, drop down and knock out 30 push-ups, stand back up, and then do 50 squats, and then resume range training.
I've worked thousands and thousands of hours of the grave-yard shift over the course of 30 yrs. Not once when TSHTF did I feel tired or drowsy. You might feel that way prior to something happening, but it's not an issue once you are engaged.
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