The Sternum Axis Tracker
Final Boss Golf treats arm–torso synchronization as a non-negotiable Fundamental. When the arms outrun the chest in the backswing, the body produces a fake turn: apparent depth without real thoracic rotation.
Trains
- The Coil — real thoracic rotation vs. arm lift
- The Elbow Plane — slot entry after connected takeaway
- Faults: flying elbow, over-the-top slice (when fake turn precedes steep delivery)
Prerequisite: stable hub via Forehead Post & Tailbone Glide—sway can mimic a fake turn.
The Fake Turn
- arms drag across the chest while the spine stops rotating
- hands finish "stuck" behind the body at the top
- transition panics into an over-the-top steep delivery
Pulling hands far behind the head does not store power—it collapses radius. True torque comes from maintaining width while the chest rotates.
Installing the Constraint
The Sternum Axis Tracker is any physical axis reference on the chest:
- a horizontal alignment stick under the armpits, or
- a wearable chest plate with a forward-pointing rod
At address, hands sit in front of the sternum. That relationship must persist through the takeaway:
- hands stay in front of the chest line
- the chest device rotates in unison with the club
- if the lead arm sweeps across the chest plane, the turn is fake
Kinematic Payoff
With hands in front at , arms can free-fall into the slot. GRF then clears the lead hip and pulls the handle along the J-Curve without getting trapped behind the body.
DIY / Range Substitutes
| Component | Substitute |
|---|---|
| Chest axis reference | Alignment rod under both armpits (horizontal) |
| Trail connection | Towel pinned under trail armpit (flying elbow cure) |
| No hardware audit | Lead-wrist watch readable at top without head turn—face visible = likely connected |
The towel-under-armpit drill and sternum tracker solve the same connection problem at different angles—use whichever gives clearer feedback today.
Progression
- Forehead Post & Tailbone Glide — hub stable
- Sternum Axis Tracker — connected takeaway at 10%
- Plane Station Connector — shallowing after real coil
- Pump Drill — transition free-fall
Using the Aid
The Sternum Axis Tracker is a tool, not a full session plan. For the integrated 50-rep session, follow the The Coil Grooving This Pattern plan and The 50-Rep Daily Blueprint. Use the progression below to dose the aid itself within those phases:
- Practice Speed: ~10% of your max · no ball — Setup with the chest device; takeaway to —hands stay in front of the sternum line. Check: chest device rotates with the club; no arm sweep across the chest plane.
- Focus (internal): chest device rotates with the club; no arm sweep across the chest plane
- Practice Speed: ~30–70% of your max · ball on — Full backswing to with hands in front; free-fall initiation from the top. Pair with the Plane Station when shallowing is the next priority.
- Focus (constraint): Full backswing to with hands in front
- Practice Speed: Up to 100% of your max · game speed — Remove the device; retain the connected-takeaway feel—the watch-visibility check at the top confirms transfer.
- Focus (external): Remove the device—not a body-part checklist
Without hardware, use a simple audit at the top: if a watch on the lead wrist is readable without head movement, hands likely stayed in front of the sternum. If the face disappears behind peripheral vision, the fake turn fired.
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