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Technical Details

  • Variable Type: Discrete Metric
  • Data Type: Boolean
  • Units: True/False
  • Column Name: lack_of_knee_drive_flag
  • Aggregation: rate
  • Precision: 0
  • Optimal Direction: Lower is better
  • Unknown Value: -1
  • Measurement: Loading knee position relative to the ankle at drive start
  • Threshold: Loading knee does not pass in front of the ankle

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Description

Lack of knee drive is a binary indicator that flags when the loading (dominant-side) knee does not drive forward past its own toe by the start of the drive phase, indicating reduced lower-body power generation into the delivery.

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Use Cases

  • Leg drive assessment
  • Power generation evaluation

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Corrective Drills

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1. Knee-Over-Toe Drive Drill

From the balance point at max knee raise, practice driving the loading knee forward past the toe before initiating the step, pausing briefly to check position. Use a side-view mirror or video to confirm the knee clears the toe. Perform 3 sets of 10 repetitions. Search YouTube: softball pitching knee drive drill balance point

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2. Resistance Band Knee Drive

Attach a light resistance band around the loading knee, anchored behind the pitcher. Practice driving the knee forward against the band’s resistance to reinforce an aggressive, forward knee drive pattern. Perform 2 sets of 8-10 repetitions per side. Search YouTube: softball pitching resistance band knee drive drill