How Ground Reaction Forces Can Transform Your Golf Swing with Terry Hashimoto

A better golf swing starts from the ground up.

In this episode, Mark welcomes Terry Hashimoto—the “Godfather of Force Mapping” for an accessible conversation about Ground Reaction Forces, Pressure Movement and the technology making Tour-level swing feedback available to everyday golfers.

Mark also announces his new role as an ambassador for AISensor, a portable 3D ground reaction force mat designed to help golfers understand how they interact with the ground throughout the swing.

Terry introduces the “Golf Number,” a simplified score based on 14 pressure characteristics consistently demonstrated by elite golfers. Instead of presenting golfers with complicated graphs and technical jargon, AISensor provides immediate feedback, a scorecard and practical recommendations for improving how pressure moves through the feet.

Mark and Terry explain the difference between "Center of Pressure" and "Center of Mass," why moving into the toes too early can contribute to an over-the-top swing, and how elite golfers move pressure from the trail heel to the lead side.

They also discuss Terry’s “Trap and Clear” concept and why apparent jumping through impact is typically the result of properly applied force—not a movement golfers should intentionally manufacture.

You’ll also learn how better use of the ground can create more space for the arms, improve clubface control, support a more compact swing and potentially reduce stress on the knees, hips and lower back.

In this episode:

• What ground reaction forces reveal about the golf swing 
• How the AI Sensor force mat measures pressure and movement 
• The “Golf Number” and how it compares your movement with elite golfers 
• Why golf swings should work from the ground up 
• How unlocking your feet can reduce tension 
• The difference between center of pressure and center of mass 
• Why premature toe pressure can lead to an over-the-top swing 
• How the trail heel helps create counterbalance 
• Terry’s “trap and clear” concept through impact 
• Why long hitters need a strong, stable lead side 
• The truth about jumping and vertical force in the golf swing 
• How pressure movement affects clubface control and ball-striking 
• Why modern golfers can generate speed with shorter swings 
• Using biofeedback to improve pitching and chipping 
• How non-contact training can help golfers develop better movement, and
• Why incremental improvement matters more than chasing perfection.

This podcast is also available as a Vodcast on YouTube - search and subscribe to Mark Immelman to watch.