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 Farmer Carry (24/16kg) 100 Air Squats / Plank Hold 90 Pull-Ups / Superman Hold 80 Sit-Ups / Wall Sit Hold 70 Burpees / Hang Hold 60 Hand-Release Push-Ups / Handstand Hold 50 Buddy Deadlifts (100/70 kg) 400 meter Farmer Carry (24/16 kg)