This is also a common exercise method in athlete training. Squat your legs down, spread one leg from the side, quickly slide to the front, and then slide the other leg from the back to the front. Don't stop and repeat, although the process is hard, the effect is good. But walking is very tiring, painful and uncomfortable, which is actually very harmful to the body. Therefore, there are few such training methods in general troops, but in some individual soldiers, for the purpose of cultivating will, there are such training methods.