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.
77 Back Squats (50/30 kg) 77 Hand Release Push-Ups 77 Hang Power Cleans (50/30 kg) 77 Kettlebell Swings (24/16 kg) 77 Walking Lunges 77 Double-Unders 77 Sit-Ups