Flying open is early rotation. The sequence shows it.

Searched as "flying open baseball swing". Here is what the phrase actually means, what the video shows, and how a measured report ends the argument.

What it looks like

• Front shoulder pulls out early, especially on breaking balls
• Outside pitch is a guaranteed weak out
• Head comes off the ball at contact

What is actually happening

Flying open means the shoulders fire before the hips have done their work, and that order is precisely what sequence timing measures. Paired with head drift, the report shows whether the player opens early out of habit, out of fear, or because the timing forces it. Each has a different fix, which is why the eyeball diagnosis keeps failing.

What we measure to find it

Every measurement comes from computer vision body tracking on one phone video, 33 landmarks on every frame, the same class of kinematic analysis professional organizations run on their players. Estimates are labeled EST, and no ball speed numbers are invented.

Drills that help

Drills are constraints, not lectures: set the task and let the player's body solve it. They work best aimed at the measured leak, which is the point of measuring first.