Does anyone have any advise on how I should workout?? I'm going to join the Marine Corps when I turn 17. I turn 16 in 20 days (February 8). I'm the most fit person I know, except for my older brother whose in the army. I do Martial Arts, and Parkour all the time, but I'm told boot camp is going to be the hardest thing I've ever done. I hope you guys can help me... Thank you.