Originally Posted by dmaipa
follow the video btb posted, thats a good place to start. since your arms are flared out to the side you are putting a lot of stress on the shoulder joint which can cause impingement. Another thing to make sure is to warm up/strengthen your rotator cuff, especially now since you've been experiencing pain in your shoulders.
Actually, I get sore but have never felt pain in my shoulders.
Anyways, thanks for the advice!!!