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that sounds like a pretty easy one to start out on. don´t even worry about winning. the sense of accomplishment you get from just finishing will be awesome. as far as training for it, just have a good diet going into it. run daily if you can, if not then just a few days a week. biking and swimming too. doing all these with a friend are best as you can push eachother and are less likely to give up or slow down.