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Forehead Post & Tailbone Glide: Axial Calibration

Before GRF or Elbow Plane work pays off, the central hub must stay stable. Dip, sway, or early extension shifts the swing center and forces micro-compensations at impact.

A wall provides immediate feedback for Forehead Post and Tailbone Glide constraints.

Trains​

Start here in most full-swing drill chains before Step-Up or Pump.

Axial Faults​

  • Sway (X-axis): hub slides laterally—low point becomes unpredictable
  • Dip/elevate (Z-axis): spine height changes—radius collapses or expands
  • Early extension (Y-axis): pelvis thrusts toward the ball—blocks J-Curve, invites flip

Forehead Post

Constraint 1: Forehead Post​

  1. Stand in golf posture without a club, arms crossed on chest.
  2. Hinge until forehead rests lightly on a wall (towel optional).
  3. Rotate the backswing slowly. Maintain steady forehead pressure through the top.

Putting use: This constraint alone—shoulders rock, head still. Pair with Start-Line Gate Protocol. Do not add tailbone glide for putting.

Epic Fail: Head Motion on the Wall

Sway grinds the head sideways. Standing up lifts the forehead off. Dipping drives excess pressure into the wall. Any change in contact = hub fault.

Constraint 2: Tailbone Glide (Full Swing)​

  1. Stand with back to the wall, golf posture, tailbone touching.
  2. Rotate backswing: trail glute presses into the wall; lead glute clears slightly.
  3. Transition: both glutes can contact simultaneously (slight squat sensation) while tailbone glides along the wall—no thrust toward the ball.

The glide preserves pelvic depth (Y-axis) while mass re-centers. Full sequence → Wall Walk.

Tailbone Glide

Progression​

  1. Forehead Post & Tailbone Glide (this drill)
  2. Step-Up Drill or Wall Walk depending on fault
  3. Category-specific work (Pump, Start-Line Gate, Trail-Hand Chip)

Running the Drill​

Forehead Post & Tailbone Glide is a foundational tool, not a full session plan. For the integrated 50-rep session, follow the Grooving This Pattern plan of the mechanic you are installing—most often Ground Reaction Forces or The Coil—and The 50-Rep Daily Blueprint. Use the progression below to dose the drill itself within those phases:

  • Practice Speed: ~10% of your max · no ball — 10 Forehead Post rotations; 10 Tailbone Glide rotations (full-swing days). Check: constant wall contact per the constraint rules. — 10% Speed Protocol
  • Focus (internal): constant wall contact per the constraint rules
  • Practice Speed: ~30–70% of your max · ball on — Maintain the hub while brushing turf or hitting slow chips/putts. Putting: forehead post + Start-Line Gate.
  • Focus (constraint): Maintain the hub while brushing turf or hitting slow chips/putts
  • Practice Speed: Up to 100% of your max · game speed: Hub stability automatic—external focus on the target, not head position.
  • Focus (external): Hub stability automatic—external focus on the target, not head position—not a body-part checklist
Optimization: Hub Before Speed

Run both constraints at 10% speed until hub stability is automatic. Unstable hubs make every downstream mechanic a compensation.

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