Originally posted by Mark Jakabcsin
This also holds true for many martial arts. Arts that require the practitioner to learn specific motions with precise angles, movements, timing and shapes are best learned/practiced when fresh or at least not totally exhausted. I am not familiar with the ROSS system so I can't comment on how learning takes place for that system. Perhaps someone can expand.
It's not connected with specific motions, merely training muscle memory. All arts and styles train some degree of muscle memory; in my experience, the Russians far more than most. Some people think of it as only applying to precise, dextrous movements - the sort of things that are the first to go out of the window in a pressure situatuion - it's not. Training flow, evasion, softness, all require subconscious response and muscle memory to take the place of paralysis by analysis.
All muscle memory is harmed by fatigue. Whatever you gain from training that way, you will gain muscle memory far slower.
So what do you gain? Physical conditioning. Familiarity with the willpower you need to go on when you're not sure if you can - in my view, probably *the* most valuable attribute for some people. Extreme fatigue symptoms mimic many adrenaline-rush symptoms - no fine motor control, loss of peripheral vision, etc - that make exhaustion-training a very good 'truth pill' for fighting approaches.
And, as you said, it teaches efficient motion very well - but you must know a little about how to move efficiently in the circumstances before you can apply it. Otherwise you would see perfect Russian movements from exhausted athletes, rather than their posture and breathing gradually degrading. Boxers don't get more efficient over time in a match; each round is more tiring than the last, until their fatigue saps their strength and their technique is reduced to nothing.
The body will resistant motions that are not efficient and substitute motions with the simplest and easiest answers.
The advantage of the Russian systems is that they offer movements that can be so utilised. But again, these movements have to be trained; the natural punch of an exhausted, highly stressed, untrained person is an exhausting haymaker - just watch a fight, in any culture. It's only by training to exhaustion, and feeling which movements feel most natural and efficient that you can utilise them.
Over time it is the goal of the Systema practioner to move as naturally and efficiently as possilbe with as little consiuous thought as possible. Training when exhausted helps to teach the body/mind the potential of moving in such a manner and helps us to let go. Eventually natural motion is attainable without being exhausted.
That seems to my point of view backwards, or at least a less efficient way than to practice the motions and then refine them under fatigue. It may be a stylistic difference, though; I certainly agree that it is a good way to study efficiency.
I wholeheartedly agree with Arthur - take the lessons from training, not just the discomfort - but he put it far better than I could.