Work on your cardio, swimming, skipping. I see your doing running which is good. Make sure your wearing suitable footwear as running on concrete can do you more damage than good.
Also as Psychoman said, check out some basic military training regimes, the web is full of useful info.
and the most important thing is what Messy said, eat the right food!, all your work is in vein if you dont have the correct fuel down ya!
good luck, have fun
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