Sickness behavior Your body is telling you to lay low, conserve your energy, don't expose yourself to danger because your number 1 priority is getting well. Depression Acute illness Exercise recovery are all examples of sickness behavior of various degrees.
I hear conflicting views on recovery days for exercise. A trainer at my old gym said always take a day off, but I see people like Mike Cernovich suggesting that you should just carry on. Who is right?