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Overtraining syndrome: some tips so you don't fall in the trap.

http://www.telegraph.co.uk/men/active/11720585/Overtraining-syndrome-five-signs-you-need-to-take-it-easy.html

Overtraining syndrome: five signs you need to take it easy Personal fitness trainer Scott Laidler explains how to spot the difference between normal post-workout tiredness and potentially harmful overtraining syndrome

Runners, check this out!
Constant high cortisol levels may be related to overtraining syndrome (OTS).
A training schedule that incorporates adequate time to rest the body allows it time to rebuild, and for cortisol levels to return to a normal state.

https://firstendurance.com/cortisol-and-overtraining-syndrome-why-an-athlete-should-care/

Cortisol and Overtraining Syndrome: Why an Athlete Should Care Jeffrey J. Rocco, MD As an active athlete are you feeling tired and rundown? Are you working harder, but going slower? Don’t feel like training? Feeling moody? Getting sick? Losing muscle, and storing fat? If you are experiencing these symptoms, you may have elevated cortisol levels due to ove...