You most likely did a push-up at some stage in your life before beginning CrossFit, but you may not have done the full spectrum of motion pushups we use in CrossFit. Your arms should be absolutely straight at the top, and your chest should be in touch with the ground at the bottom.
800 meter Medicine Ball Run (20/14 lb) 100 Kettlebell Swings (53/35 lb) 10 Tire Flips and Jump Thru (As Heavy As Possible) 4 200 meter Fire Hose Drag and Pull (50 ft) 100 Alternating Kettlebell Cleans (53/35 lb) 50 Push-Ups 50 Step Walking Lunges