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From Fellrnr.com, Running tips
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No, that's one of the biggest misunderstandings of this theory. It's true that if we had more [[Mental fortitude]] and could bear more suffering, we could run further or faster. However, such a simplistic view is misleading. The absolute limit of performance is set by our biomechanical ability, and the central governor defines how close to the absolute limit we can get. Consider the analogy of holding your hand over a candle flame; how long you can keep your hand in place is dependent upon your pain tolerance. If you had greater pain tolerance you could withstand a greater degree of burning, but any normal person will remove the hand before significant damage takes place. The difference in pain tolerance just gives some variation in the amount of damage we can stand. In the same way, greater [[Mental fortitude]] will allow us to push our bodies harder, but it does not allow us to ignore our biomechanical limits. For example, let's say that without the central governor, running at 5:00 min/mile would cause catastrophic damage, such as a torn tendon. If I'm on a training run, I might be able to push myself to run a 6:00 min/mile before the suffering overwhelms my [[Mental fortitude]]. If I'm more motivated, such as a big race, then the extra [[Mental fortitude]] might allow me to run at a 5:30 min/mile pace rather than a 6:00 min/mile pace. But no matter how motivated I am, I can't go faster than 5:00 min/mile, and realistically I'm unlikely to get close to that speed. A faster runner might suffer similarly at a 4:30 pace to my 5:30 pace, and a slower runner might suffer the same at 7:30. Someone who is unfit might suffer the same at a 13:30 pace.
=The Rev Limiter Analogy=
An analogy would be the rev limiter in a car. The rev limiter prevents the engine turning over too quickly and getting damaged. Without the rev limiter you'd get more performance from your car, but not an unlimited amount and not without risking engine damage. One performance modification is to change the engine management system so the rev limiter is higher, which eeks ekes out a little more performance at the cost of greater damage. Likewise, we can push the boundaries of our Central Governor and get slightly more performance. This translates to potentially better race times and potentially better training results. But push too hard and you get injured or [[Overtraining]].
=Why does it matter?=
