Fitruvian Pitching Lab on Instagram: "How to throw a Knuckle-Curve. This pitch is a killer if you are able to execute it. Usually thrown harder than the typical curveball, a knuckle curve is a great option for a harder breaking curveball that will usually have more spin efficiency than a slider. Play with it and see if it works for you. Also, thank you to @Yankees stud @clarkeschmidt for the slo-motion demo! He has been a master of this pitch for a long time. #pitching #baseball #mlb #velocity #