Push-Up
How you do a push-up is a good measure of how you approach your training in general. A full range of motion push-up with quality is not an easy exercise for most and should be a staple in any training program, or warm-up for more advanced athletes.
Cues:
Start in a plank with locked elbows and fully protracted shoulders
Lower until the chest touches and push back up
Allow the scaps to come together as you lower and then spread apart as you push into each lockout at the top
Mistakes:
Sagging core at any point
Not touching chest at bottom
Not locking out fully at the top
Flaring elbows, pushing at unintentionally awkward angles