Here’s the thing…
Because the major muscle groups involved in pitching are in your shoulders and arms, it is vitally important for you to ensure that they work as a unit and that the arms don’t disconnect from the body.
A wonderfully effective yet simple drill to help you achieve this is to hit 50m pitch shots with a towel under your arms, as illustrated below.
Not only will this ensure that your arms & shoulders work together as a team, but you will feel that your arms and shoulders stay connected throughout the pitch.