you know, as much i might make this whole thing up ive heard it somewhere. the brain produces a cannibis like substance. when you exercise this substance is created, which i think is dopamine. if i feel bogged down with uni work, it gets to me alot because my future depends on it. i can play a strenuous game of squash and come away feeling the best of shape. and when i mean strenuous, i mean where my eye lashes have been saturated with sweat. at that point i just feel high in motivation for everything that needs to be done. im also bladder shy too, especially in my local pub when druggies are doing their lines a yard from me