I am 12 years old and am normally a top pitcher for every team I play on. My accuracy is usually spot on and I vary my speeds well. Currently, I throw high 50’s which I would like to improve a substantial amount. My coaches say to “use my legs more” when pitching but I’m not really sure what they mean. They believe if I do this I can really reach the next level and improve my speed. If anyone could ellaborate more and possibly give me some advice on what my coaches mean it would be great!