To do a correct Marine Corps crunch, lay on your back with your feet flat on the deck, and your butt close to your heels.  Your arms should be crossed on your chest or your stomach.  They cannot come off of your chest/stomach during the PFT. To do a correct crunch, raise your upper body off of the deck until your forearms touch your thighs.  Go back down … Continue reading Quick N Easy PFT Crunches