Originally Posted by
silmarillion
If you constantly push threshold without giving your body a chance to recover, you will quickly notice an increased fatigue level. This will make you feel weak and you will never seem to recover. Guess how I know this....
Well it's not always the case.
I have been training at a very intense level for 2 years. 6 or 7 days a week, from 1 to 5 hrs a day. I respectively rested 21 days and 28 days of each year. I got this increased fatigue level for a while then the body adapted and this fatigue just went away.