It’s best to be prepared physically when you join the United States army. It’s not rare to see some really crazy workout routines come out of that place. But none of them look as hard as the ‘300’ routine. The aim of this workout is to do 300 reps of six different exercises. All before embarking on this never-ending cardio routine.‘300’ from the US army: weight training part1. Pull-ups: 50 reps2. TRX push-ups or bench presses: 50 reps3. Curl to press: 50 reps4. Kettlebell swings: 50 reps5. TRX rollouts or plank: 50 reps or 5 minutes for plank6. Tricep dips: 50 repsYou are free to choose how you want to complete this set of exercises, meaning you can do the exercises one by one or in a pyramidal way, or even by combining the exercises that use antagonistic muscles. The goal is to take as few breaks as possible, all while conserving your energy for the second part of the workout.‘300’ from the US army: cardio part1. Running: you have to run 1 mile (1.6km), keeping in mind that this is a long race. Try to run at a fast speed but not too fast.2. Farmer’s walk: 400 meters holding dumbbells or kettlebells.3. Running: 1 mile just like the first run and you have to run at the same speed for the same distance.4. Farmer’s walk: 400 meters holding dumbbells or kettlebells.5. Running: This time, run for 1 mile as fast as possible. Give it all you got.6. Bear Crawl: Go for 200m in this position, making sure your elbows don’t touch the floor.7. Running: One last mile but this time to recover. Calmly.Once all this is done, you can go home and sleep, since you’ll undoubtedly have no strength or energy left in your body.Check out the video above for more on this gruelling workout routine - reckon you're ready to take on the challenge?