Help me through this - dd's coach wants her to really focus on changing speeds on all her pitches. While I agree with this, he wants her throwing a super slow rise at 40ish. Her regular rise comes in around low 50's which is about 5 mph slower than fastball. She gets very nice backspin on it, but seriously at 40 how will that ball do anything but drop? Is it just that the backspin will give it a different look? I'm confused.