A defining moment for many youth baseball hitters occurs somewhere between the ages of 12 and 15. This is typically the age range when most pitchers begin throwing curveballs and other breaking balls. That first taste of changing speeds and movement on pitches can be a real eye opener for young hitters. Flaws in their mechanics and mental approach will become magnified. If they don’t learn to make adjustments quickly, they are bound to have many frustrating at bats in their future. That frustration, sadly, can mount to a point that would make anyone want to quit the game …