These podcast excerpts from Henrik Jentsch of Golf Academy 360° powered by Sportsbox explain best practices in golf training related to the swing, especially the movement of the pelvis and chest. Jentsch describes how he uses Pelvis Sway and Chest Sway trackers to analyze the lateral motion of these body parts throughout the swing and discusses the results with the golfer. He also explains the concept of the Sway Gap—the difference between pelvis and chest movement—and its significance for achieving optimal ball contact. Finally, the analysis is used to help golfers develop a better feel for correct motion.
The key swing motion metrics analyzed and compared in terms of golf sway are Pelvis Sway and Chest Sway.
These are first examined individually by tracking how far the pelvis and chest move from their starting position throughout the swing using motion trackers.
For instance, at the top of the backswing, the pelvis might be 0.8 inches from the starting point, while the chest is 1.1 inches away. These individual values are then compared at various swing positions such as the top of the backswing, halfway through the downswing, and at impact.
Next, the Sway Gap metric is analyzed. The Sway Gap represents the difference between pelvis sway and chest sway at any point in the swing. For example, at address, the Sway Gap may be -2.2 inches, meaning the chest is positioned 2.2 inches behind the pelvis. This gap is evaluated throughout the swing to assess how the relationship between pelvis and chest movement changes. At impact, for instance, the chest might be slightly more forward relative to the pelvis than what’s considered ideal.
By analyzing and comparing these metrics—individual Pelvis and Chest Sway values as well as the Sway Gap—golf coaches like Henrik Jentsch can determine whether the swing motion is optimized in terms of sway and what adjustments may be needed to improve ball contact and flight.
Analysis Steps and Key Points from Henrik Jentsch:
1. Individual Analysis of Pelvis and Chest Sway:
Use Pelvis and Chest Sway trackers to monitor motion throughout the swing.
Review how the pelvis and chest move away from their address position.
Compare distances at key positions: top of backswing, halfway through downswing (club horizontal), and at impact.
For example, at the top of the backswing: pelvis moved 0.8 inches, chest 1.1 inches.
At halfway down, ideally the pelvis should lead. In the podcast example, chest sway was 3.6 inches and pelvis sway 3.2 inches—chest was ahead.
At impact, pelvis sway was 3.8 inches, chest sway 3.6 inches. A chest sway above 2 inches is considered outside the typical range.
Excessive chest sway can cause the low point of the swing to shift too far forward, leading to thin shots or lower ball flight.
2. Analysis of the Sway Gap:
After looking at individual sway metrics, the Sway Gap is assessed.
The Sway Gap = Pelvis Sway - Chest Sway.
At address in the example, the Sway Gap was -2.2 inches (chest behind pelvis). Normal range is between -1.6 and +0.4 inches, ideally 0.
During the backswing, the Sway Gap stayed above average in the example.
At impact, the chest was slightly more forward relative to the pelvis than ideal.
The Sway Gap shows how the pelvis and chest relationship shifts throughout the swing.
By understanding these relationships, a coach can identify whether the motion is efficient and provide targeted drills and feels to help the golfer improve both sway and Sway Gap for better ball contact.