Read tennis footwork as a sequence from recognition to recovery.

First move

Start the review before the player runs toward the ball

A late contact point can begin before the first large step. The player may finish a split step after the ball has already revealed its direction, stay upright while deciding, cross the feet when a smaller organizing step would be enough, or move immediately without first establishing balance. Video is most useful when it shows the player before the feed or opponent contact as well as the movement that follows.

The first move should be judged against the task, not a universal foot pattern. A short lateral ball, deep defensive ball, inside-out forehand, return of serve, and recovery after a wide shot require different solutions. The practical question is whether the initial organization gives the player time and space for the next decision.

Adjustment steps

The final steps should solve distance, not merely reach the ball

Large early steps can cover space, but the approach usually needs smaller adjustments as the bounce and contact window become clearer. When those adjustments stop too early, the player may reach. When the body continues crowding the bounce, the arm may become trapped. A useful review follows the changing distance between the feet, torso, hitting side, and expected contact area.

Count steps cautiously. More steps are not automatically better, and a two-dimensional camera can hide depth. Look instead for whether the player can accelerate, reduce step size, and organize the base without an abrupt final lunge. Several repetitions help distinguish a stable movement habit from one difficult feed.

Contact spacing

Use contact evidence to work backward toward the feet

Crowded or stretched contact is often described as an arm problem, yet the visible cause may begin with movement. The player can arrive on the wrong line, take one step too far, stop adjusting before the bounce, or place the base where rotation has no room. Review the final approach together with the hitting-side structure rather than prescribing a hand position from one frame.

Camera perspective limits certainty. A direct rear view compresses forward distance, while a side view can hide lateral spacing. The ball may blur or disappear near contact. ACEAI can organize evidence from the clearer frames around that moment, but it should state when exact ball-to-body distance cannot be established.

Balance and recovery

A useful finish preserves options for the next ball

Balance does not mean remaining still after contact. A wide defensive shot may carry the player outside the court, and an attacking forehand may continue forward. The useful distinction is whether the player manages that momentum intentionally or needs extra steps simply to avoid falling.

Recovery direction depends on court position, shot direction, and the likely reply. ACEAI can describe visible posture, foot placement, and the first movement after the stroke, but a short technique clip cannot calculate ideal court coverage without reliable ball and opponent tracking. Treat recovery feedback as movement review, not a tactical map of the point.

Film and practice

Make the camera wide enough for movement but close enough for evidence

A rear three-quarter view is a practical starting point for groundstroke footwork because it shows court direction, lateral spacing, much of the body, and the first recovery step. Place the phone outside all player and ball paths on a stable support. Keep visible court lines in the frame so movement direction is easier to interpret.

Record five to ten repetitions of one pattern: for example, cooperative cross-court forehands, alternating lateral feeds, or a controlled approach-and-recover drill. Keep the starting position and target broadly consistent. If the player becomes too small in a wide frame, move the camera closer only while preserving safety and the complete movement area.

Technique analysis and match analysis are different products. ACEAI does not use this workflow to call lines, reconstruct ball trajectories, count unforced errors, measure court coverage, or produce match statistics. Its purpose is to connect visible movement evidence to a focused practice cue and then compare that cue in a later recording.