Obsticle course in september

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Mar 24, 2013 6:11pm
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Im new to working out. I was in the army 10 years ago and im noy over weight but im very weak and have no endurance. I want to do an obsticle course marathon in september. Any suggestions on how often i should work out and for how long? For example, one long workout or a few short ones throughout the day. And every day or everyother day? Any info would be greatly appreciated.