Racket speed
Racket-head speed at ball impact.
THE CURRENT SWINGFLUX FRAMEWORK
48 metrics. Four stroke families. One coaching language.
The current SwingFlux framework groups 12 coaching metrics around the serve, forehand, backhand and return of serve. The aim is to make sensor output easier to connect to recognizable technical questions.
HOW TO READ THE 48
Use the metric as evidence, not as a score.
Individual numbers are most useful when interpreted with the player's technique, task, intent and baseline. SwingFlux is designed to support the coach's decision-making rather than replace it.
SERVE
12 serve metrics
Racket acceleration
Acceleration of the racket head during the upward swing.
Impact timing
Timing of ball impact within the serve sequence.
Elbow speed
Elbow movement speed around the impact phase.
Elbow timing
Timing of elbow extension relative to impact.
Pronation
Forearm pronation through the acceleration and impact phase.
Racket drop
Depth and timing of the racket-head drop before acceleration.
Lag & release
Creation of racket lag and the timing of release into the ball.
Shoulder rotation
Rotational contribution through the serve.
Toss consistency
Repeatability of toss height and placement.
Body alignment
Body orientation relative to the intended target at impact.
Contact height
Height of racket-ball contact.
FOREHAND
12 forehand metrics
Unit turn / shoulder turn
Amount and timing of shoulder turn during preparation.
Takeback height
Racket height during the takeback.
Takeback length
Length of the racket preparation path.
Elbow position
Elbow position during preparation and transition.
Racket drop
Racket-head drop before the forward swing.
Hip & core rotation
Rotational contribution through the forward swing.
Swing path direction
Direction of racket travel into impact.
Racket face angle at impact
Racket-face orientation at contact.
Impact timing
Timing of contact within the stroke sequence.
Impact racket speed
Racket speed at impact.
Contact point location
Where contact occurs relative to the racket/string-bed reference.
Follow-through & recovery
Post-impact follow-through and recovery pattern.
BACKHAND
12 backhand metrics
Unit turn / shoulder turn
Shoulder and upper-body preparation for the backhand.
Takeback height
Racket height during preparation.
Takeback length
Length of the preparation path.
Elbow position
Elbow position through preparation and transition.
Racket drop
Racket-head drop before forward acceleration.
Hip & core rotation
Rotational contribution through the stroke.
Swing path direction
Direction of racket travel into impact.
Racket face angle at impact
Racket-face orientation at contact.
Impact timing
Timing of contact within the stroke sequence.
Impact racket speed
Racket speed at impact.
Contact point location
Contact location relative to the racket/string-bed reference.
Follow-through & recovery
Post-impact follow-through and recovery pattern.
RETURN OF SERVE
12 return of serve metrics
Reaction time
Time from the relevant serve event to initiation of the return movement.
Unit turn / shoulder turn
Amount and timing of upper-body preparation.
Split-step timing
Timing of the split step relative to the incoming serve.
Preparation height
Racket-head height at the end of preparation.
Takeback consistency
Repeatability of the takeback pattern.
Forward movement
Timing and amount of forward movement into the ball.
Swing path direction
Racket-path direction relative to the incoming ball.
Racket face angle at impact
Racket-face orientation at contact.
Impact timing
Timing of racket-ball contact in the return sequence.
Impact racket speed
Racket-head speed at impact.
Contact point location
Contact location relative to the racket/string-bed reference.
Recovery position
Post-contact readiness and recovery pattern.
DEEPER IMPACT VIEWS
Contact and impact can sit underneath the headline 48.
Your supplied analysis material also includes an eight-parameter impact-quality layer and racket-ball contact-location view. These are presented as deeper diagnostic layers rather than being added to the headline 48 count.
Development note: these names describe the current SwingFlux analysis framework shown in the supplied product material. Exact calculation methods, units, thresholds and product-specific validity/reliability should be documented from final system testing before they are presented as validated commercial performance claims.