The key to hitting performance is hitting the ball hard. To improve performance, focus on identifying specific problems related to performance or potential injuries. If the player has good bat speed, avoid unnecessary changes. Utilize biomechanics to understand the mechanics of a good swing. By analyzing biomechanics reports, one can identify issues like lack of separation between hips and shoulders during rotation. This information is best discussed off-field to avoid overwhelming the player. Coaches should design constraints based on biomechanical insights rather than overwhelming the player with internal thoughts.