With the advancement in bowling balls and the cover-stocks (outside shell) used on modern bowling balls it has been necessary to change how the ball is released to achieve the maximum power and pin carry to compete at a higher level. Something I have had to learn over the years because back when I started, the bowling balls were basically custom drilled house balls, just like the ones on the racks at bowling centers all over the world today. My how times have changed!
Here is a great video showing the new modern release needed to bowl at a higher level.
Just click on the link below.
http://www.stormbowling.com/news/2014/10/4963