Quick answer: Face-on: after impact the arms fold in early and the club whips inside immediately; the frame with both arms extended toward the camera never appears.
What it does to the ball
The arc shrinks: lost speed and short shots leaking right.
Root causes (by frequency)
Unconscious deceleration into impact
Chicken wing or a blocked release
A lack of torso rotation to pull the arms through
How to fix it
Chase the ball with the club: the clubhead travels straight and low toward the target for a meter after impact
Drills that fix it
Arms to the camera · 15 min · 15 reps
Recover extension after impact Set your phone recording face-on. Hit balls at 70%, chasing the frame where both arms are extended and pointing at the camera after impact. Review the video every 5 balls until you capture it consistently.
Frequently asked questions
What is "No extension toward the target" in the golf swing?
Face-on: after impact the arms fold in early and the club whips inside immediately; the frame with both arms extended toward the camera never appears.
What does no extension toward the target do to the ball?
The arc shrinks: lost speed and short shots leaking right.
How do you fix no extension toward the target?
Chase the ball with the club: the clubhead travels straight and low toward the target for a meter after impact
Sources
David Leadbetter — The Golf Swing
Dr. Young-Hoo Kwon, Texas Woman's University — Golf Biomechanics Instructor Program (secuencia cinemática, plano funcional)