During the first few weeks of basic, it is pretty intensive "endurance" activities over "pure" strength activities.
The run type in boot camp is called the "Airborne Shuffle". Its slightly slower than a jog with short steps. You will have to progressively get to the point you can run at this type of speed for long periods of time (miles).
In addition, your upper body has to have alot of endurance and strength, but more endurance than strength. VERY high reps of pushups, situps, mountain climbers, chin ups (pull ups).
You have to have strength in your legs, but more "endurance" than "strength". I have see many big strong guys, bow out, because they didnt have the "endurance that is necessary" for the type of training being applied.
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I had to act like a dying "Cock Roach" once when I messed up, and had to do it for 25 minutes while they drank coffee and laughed. The more I laughed, the more trouble I got in. ----------->cant take it too seriously, ya know, it is a mind game, but yet one has to control emotions, or "you see your D@ck in the dirt" many times. LOL
I went in the barricks with my boots on..........Oopps!

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Another time, I had to put my head fully submerged in a camode (toilet for the young ones), and flush it........the drill Sgt. stated: "Thats your brain going down, you maggot!"
Then out for "Grass Drills": Push ups, situps, for another 25 minutes. Just me and the Drill Sgt on my @ss. LOL
Because, I went into the barricks with my boots on again, the very next day.

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With the type of upbringing I had (self-esteem destroyed by parents), boot camp (though I hated it when I was going through it) was a MAJOR positive experience in my life and I look at it from many different angles and perspectives. One thing you will learn (if you go), is that the human body can withstand alot more stress than one thinks.
Boot camp and other army types of training, brings this to a clear point. Going with 2 to 4 hours of sleep, running miles and miles, and doing hundreds upon hundreds of pushups (and other exercises), withstanding severe cold, heat, and pain,
proves one can do more than they think they can (when healthy), as MILLIONS of men and woman have gone through it.
Chillen