Your muscles use glycogen (a form of sugar) as fuel. When you perform work your muscles use up that glycogen, this puts your muslces in a glycogen depleated state. Thats where the term depletion workout comes from.

thanks kane, today was a bitch. I just got back from my workout and I'm wiped. I'm sitin here sippin on my purple wraath, trying to concentrate on studying ... shit is not easy man.

here is a quick run down of what my meals were like today

8am 1/4lb turkey breast, 1 scoop ON 100% whey
12:30pm 1 can tuna, 1tsp real mayo,1/2 green pepper
5pm 2 scoops ON, 4 stalks celery, 2 tsp natty peanut butter
6:30pm 1 scoop purple wraath, 1g citruline, 1g alcaar
8pm 1 scoop purple wraath
9pm 1 flank steak, broccoli, green pepper

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I don't do this for my family, my friends, women, accolades, pride, or ego. I do it for me and no one else, its just part of who I am.