You love basketball. You love it so much you play every day. Maybe you play in a city league, are trying to make the school team, or want to be better than all your teammates. That means you have to practice all the time. You have to shoot hundreds of free throws and hundreds more shots from inside and outside the paint. You shoot until you re tired, and then keep shooting because nothing will make you better at basketball than muscle memory. But once you commit, how do you know whether or not all that work is actually paying off? You might feel like you shot the ball well during your hour-long practice, but do you know that for sure?