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Technical Details

  • Variable Type: Discrete Metric
  • Data Type: Boolean
  • Units: True/False
  • Column Name: knee_collapse_flag
  • Aggregation: rate
  • Precision: 0
  • Optimal Direction: Lower is better
  • Unknown Value: -1
  • Measurement: Change in front knee flexion angle from foot contact to release
  • Threshold: Front knee flexes more than 20° from its angle at foot contact

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Description

Knee collapse is a binary indicator that flags when the front (lead) knee bends more than 20° from its foot-contact angle by the time of ball release, which can reduce the stability of the front leg block and limit energy transfer into the pitch.

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Use Cases

  • Front-side stability assessment
  • Mechanics evaluation
  • Injury risk identification

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Corrective Drills

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1. Firm Front Leg Drill

Practice the delivery focusing on maintaining a firm, extended front leg from foot contact through release, blocking rather than continuing to bend the front knee. Use video from the side to check knee angle at foot contact versus release. Perform 3 sets of 10 repetitions. Search YouTube: softball pitching firm front leg drill block

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2. Wall Sit Stability Drill

Build front-leg stability with wall sits and single-leg balance holds targeting the quadriceps and glutes, then apply the improved stability to the delivery. Consistent lower-body strength supports a stable front-leg block at release. Perform 2-3 sets of 20-30 second holds. Search YouTube: softball pitching front leg stability strength drill