The Usa States Marine Corp. boot camp is world renowned to be one of the highest demanding physical undertakings. This is something you want to ideally prepare for well in advance. You will want to build towards the Marine Workout.
If you are out of shape, or perhaps overweight, you want to get started on out slowly but surely and start easy. Also if you are moderately fit, if you are not used to a hard training routine, being gradual remains key. Yes, in the Marines you will be pushed to breaking point and beyond. However, to build core fitness the more gradual you address your training routine, the better. And then you work up to a full Marine workout routine.
Two major areas you want to operate on are, cardio and building your core muscle strength. If you are fairly out there of shape, you can start with a fast walk for 30-45 minutes. For muscle strength exercises like standard pushups, situps and squats are great to get started on (say 20 reps with 3 sets, or whatever feels more comfortable to start). If you are fitter you can step this up to a jog and more reps for your models. Including a rest day between workouts is ideal. The particular major purpose the following is to not make your workouts too much and keep them consistent.
You want to add brief bursts intervals to your cardio. Inside the Marine Muscle Corp., you will be going on runs three times a week for about three kilometers. You will constantly be marching everywhere you go. Plus you will also be doing a great deal of short sprints. So because of this, your cardio has to be constantly aerobic (free breathing), with short bursts of anaerobic (absence of) in your workouts.
Another core requirement in the Marines is your ability to swim. If you don't know how, and/or not a very good swimmer, you require to fix this immediately. Get swimming lessons from a professional instructor and get as good as you can at swimming.