Not to be hard on these guys, I know several of them actually have the background to give these books some credibility, but do an amazon search for military fitness. Lots of books with similar titles pop up. Spec Ops Workout, Navy Seal Fitness, Special Operations Fitness, etc. Maybe not a ton, but a few. My main gripe with the current books is the huge emphasis on muscular endurance or 5 mile runs and not much else. Too many of the workouts look like this: 30 push ups 30 sit ups 30 lunges 30 mountain climbers 30 side straddle hops Next workout will be other bodyweight exercises, or a run. You will progress by adding reps. Weighted exercises are not given much attention. And sure I trained exactly like this for my first year or two in. Then I did crossfit for a few months, which thankfully introduced me to KBs and barbells. The bodyweight only chippers are fine for boot camp prep, but getting Strong really makes carrying a ruck, armor, guns and ammo, a lot easier.