Joe Zeller on Instagram: "Insane 9u Knuck! many people think that it’s hard to learn at a young age But actually, this is the perfect time to learn because that’s when your brain is the most adaptive to learning difficult things A lot of the best knuckleball has learned it when they were young like Phil Niekro Of course, you can still learn it at any age as some major league knuckleballers learned it later in their career But it’s always best to start young to try to find true mastery of anythin