Aren't you supposed to have cortisol after you lift? For hormeesisisisiesisiz?
Yes, you will have a spike no matter what, but you don't want it to be too high. Some people are predisposed to extra high cortisol spikes, and elevated cortisol for extended periods of time post-workout. In these people, extra measures to blunt cortisol are helpful.
Having low cortisol is a good thing in itself, unless the reason for low cortisol is adrenal fatigue or from chronic stimulant abuse....
You always have to look at the whole picture, when one hormone imbalance is noted, it's probable that others are also involved, however, let it be known that bodybuilders often demolish their cortisol levels and they feel perfectly fine, the majority at least!
IT'S ALL ABOUT THE REASON FOR BEING, WHY IS CORTISOL LOW...IT CAN BE GOOD, OR IT CAN BE BAD..DEPENDING ON THE REASON BEHIND THAT LEVEL!
Also, one level doesn't mean that much in contrast to another unidentified imbalance, for example, what good is low cortisol if you also have high estrogen? Same with the other way around, what good is low estrogen, or optimal estrogen, if you also have high cortisol?
Thus the whole picture has to be taken into account...!