My friend and I are hiking the Appalachian Trail this summer after graduation. We’re both athletic and are willing to work HARD to get in shape for this. He is a skier, and I am a runner and the more punishing the work out the better, but it has to be relevant, so bring it please.

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How can I prepare for hiking the appalachian trail?
can i bring a gun for protection hiking on the Appalachian trail?
What type of apparel should i wear/bring on my hiking trip to the appalachian trail?