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Reduces stress; all those endorphins created by the exercise carry on for hours. I used to lift before work on one particularly hellish job, and I don't think I would have lasted without the afterglow from the morning workout.
My resistance to disease also improved. When I started lifting, I was living in a drafty apartment in a cold and foggy city, and I got one respiratory bug after another; I spent a lot of time coughing. When I started lifting weights and put on a little muscle, I caught fewer bugs.
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