In my limited experience of bowling for about 6 months daily, My normal shot is about 18.5 mph, and if the ball is hydroplaning down the lane it's going to fast. When I throw the 18mph shot I am totally not trying to throw it fast, infact my arm position at the start is already around 45 degrees. When I slow it down, my arm is really down torwards teh floor. But my advice isn't of an expert, but I have been making alot of progress. I think I'm going to experiment throwing the slow ball down the middle of the lane sometime.
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