Stroke quality{{ sessQ }}
Contact across the string bed
FHBH
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● more contacts● fewer● off the node
80% land heresweet spot
Where your swing stops repeating
FHBH
Traces fan out 140 ms before contact — it's the preparation, not the wrist.
Each line is one forehand's racket speed, aligned on contact. A tight bundle is a repeatable swing.
Face through the swing
FHBH
The ribbon closes over the ball — a healthy topspin shape.
Racket face orientation swept along your swing path. Slice rolls open, flat stays flat, topspin closes.
Wrist peaks 42 ms before the racket — well sequenced.
Reversed order would mean you're pulling with the arm.
● wrist● racket
45 of 60 strokes land within ±4° — a tight core with a slight rightward drift.
Swing directions from the wrist, binned by angle. Brighter wedges are where your strokes concentrate.
● 8–10 strokes● 4–7● 1–3● outliers
60 strokes · 2° bins · angles shown at 3×
Grouping held for 80 strokes, then loosened. Spread went from 1.5° to 8.7° over the last 40.
Face angle at contact, open is up. The band is where 80% of strokes land. The turn comes about 35 minutes in.
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