For the last few years I have suffered from extreme mental and physical fatigue. I notice it most when I am playing basketball or doing something that involves standing for long periods of time (like shopping with the wife). I’m 31 now have and have been weight training for the past 12 years. I am also a PE teacher and work for an afterschool program so I am usually on my feet for 9-10 hours at work. I’ve done some reading and the main thing that stuck out was adrenalin depletion because I have exercises regularly for the past 12 years and in my younger days (am I old enough to say that yet ) consumed lots of energy drinks prior to exercising. The best way of describing this is fatigue is feeling spaced out and weak. I normally can continue the activity but not at 100%. Over the summer I competed in mountain biking but I rarely noticed this fatigue. I have tried to cut back on my coffee and sweets to keep my caffeine dependency and blood sugar in check.