It is extremely important to have the ability to flex muscles isometrically to improve strength, physique, and fitness. When you flex and hold certain muscles in your body it teaches your how to use your brain to engage certain parts of musculature. Learning how to flex your rear deltoids and other muscles you will be able to recruit them better when doing actual dynamic training exercises.
Try these isometric contractions and you will gain awareness in your brain, strength in the contractile tissues, and get a great pump. These exercises above are extremely functional movements and positions so it is not all about aesthetics. Play around with these movements and you will reap the benefits
Here is a great workout that will help you. Try it, and let me now what you think.
