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'''Exercise does not make you fit, it's the rest that follows exercise that makes you fit.''' This is a critical aspect of training that must be understood. This is how a single bout of training impacts your fitness:
[[File:Supercompensation-small.png]]
Note that the training reduces fitness, and that rest time is required to gain the benefits.
Ideally, you will get sufficient rest so that you recover from the training stress and get the maximum benefit. This would mean starting the next training session near the peak of supercompensation, as shown below.
[[File:Supercompensation-continued-small.png]]
(The image is quite wide, and may not show up fully on a low resolution screen - there is a scroll bar at the very end of the article, or [http://jfsavage.smugmug.com/photos/760137714_Xiw68-X3.jpg view])
Without sufficient rest, you may start your next training at the end of the period marked ‘Recovery’. This means that you have not benefited from the training, just barely recovered from it. This can carry on indefinitely, with no improvement in fitness.
[[File:Supercompensation-stagnation-small.png]]
Without even sufficient rest to recover from the training stress, the fitness level starts to decline, with each training bout further reducing fitness. Sadly, the response to this is often to increase the training stress, creating a positive feedback cycle. Eventually this will result in some type of injury.
[[File:Supercompensation-fatigue-small.png]] ==Intensity and Supercompensation==Different intensities produce different levels of fatigue and resulting supercompensation. In the diagram below, the blue line shows insufficient intensity, producing only a small amount of supercompensation. The orange line is too intense, requiring so long to recover that little supercompensation occurs. The red line shows far too much intensity, resulting in an inability to supercompensate. The black line shows an intensity level resulting in injury rather than supercompensation. Thus it is important to work out the right level of intensity to produce the required level of supercompensation. This is a 'Goldilocks' situation, where too much or too little intensity produces a negative outcome. For each individual, there is an optimum level of exercise and recovery that produces the best supercompensation. The most common problem in highly motivated athletes is when they are working too hard with too little rest, they understand that they are not improving, but they adjust the wrong way and try to work harder. Exercise is not a situation where 'more is better'. [[File:Supercompensation-Intensity-small.png]] ==Different Systems==The diagram below represents a personal hypothesis based on my observation that long runs and speedwork can be combined. After a long run, it is quite practical to perform speedwork and gain benefits, when doing a long run at that point in the recovery would produce serious fatigue or injury. My hypothesis is that the long run primarily affects the endurance fitness and speedwork primarily affects aerobic fitness. Thus a long run triggers the endurance supercompensation curve (red), but does not have much impact on the aerobic supercompensation curve (green). Likewise, the speedwork triggers the aerobic supercompensation curve (green), but does not have much impact on the endurance supercompensation curve (red). In practice, things are probably a lot more complex than this, but I believe this is a useful model. (As George P. E. Box said "All models are wrong, but some models are useful".) [[File:Supercompensation-different-systems-small.png]]
== How long to rest? ==
== Too much rest? ==
It is possible to get too much rest. Trying to gain fitness on one or two days training per week does not seem to work for most people.This can be shown in the image below. [[File:Supercompensation-toomuchrest-small.png]]