A variation of the standard superman…
… the superman press will kick those stubborn postural muscles into action!
You should be able to feel the kinetic chain working from your gluteus all the way up to your trapezius muscles. Be sure that your thumbs are facing upwards and that you are lifting everything off of the floor – chest, arms, thighs, everything! Use this exercise along with others that will strengthen your upper back/rear shoulders in order to correct issues like kyphosis, lordosis and a poor posture.
Learning how to clean with great technique takes a lot of practice. Seated KB Cleans is a good starting point.
Most people struggle with the flipping movement that requires you to get your elbows up and under the bar. If you begin working on the technique sitting down you can concentrate on it without having to worry about using your legs. Once you master it, moving on to KB Swing Cleans (standing), KB Cleans, and then Cleans with a barbell, is a good idea.