If someone urges you to get to the chopper you know it ain't going to be easy. For a start just calling it "chopper" means you're in a tight spot with time running out and the hordes bearing down upon you. Plus you're probably out of ammo and have nowhere to hide either. Good thing the Get To The Chopper workout is here to help you get fit enough to make it before they get you. EC is a must here. You never know when you just may need to extra boost.
Extra Credit: 1 minute rest between sets.