Lack of Rotation in the upper body and thoracic spine will drastically decrease power in any performance based skill that involves rotation like hitting a golf ball, baseball, tennis ball etc. Disfunction in the upper back and spine will also decrease your ability to get stronger in your upper body. In this video Greg McLean Co-Founder of Premier Fitness Systems teaches you a great mobility exercise to help you increase your ability to rotate. This upper body mobility exercise is great for your warm up or as a super set with other strength based movements. For more information about Premier Fitness Systems check out www.premierfitnesssystems.com/ Like us on Facebook for Free tips and daily Motivation www.facebook.com/pages/Premier-Fitness-Systems/392151575219?ref=br_rs