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.
400 meter Run 26 Hand Release Push-ups 400 meter Run 26 Kettlebell Swings (53/35 lb) 400 meter Run 26 Sit-ups 400 meter Run 26 Deadlifts (75/55 lb) 400 meter Run 26 Air Squats 400 meter Run 26 Box Jumps (24/20 in)