Filming your serve is the highest-leverage habit in the whole motion, for a blunt reason: the serve is almost impossible to feel accurately from the inside. Players swear their racquet dropped when video shows the strings facing the sky the whole way; they feel like they reached tall when they met the ball barely overhead. The camera settles arguments your body keeps losing to itself.
But a clip is only as useful as it is readable — by your own eyes or by video analysis. Here's how to film serves that tell the truth.
The non-negotiables
Fix the phone. No follow-cam. Tripod, fence post, a bag against the net post — anything steady. A friend holding the camera adds motion that makes body movement much harder to judge. Fixed camera, moving server.
Whole body, racquet, AND the toss in frame — with headroom above your reach. The serve is the one motion that goes up out of the frame if you're not careful. Leave sky above your fully extended arm, because the two things that matter most, your reach at contact and your toss arm at its peak, both happen at the top.
One serve per clip, and start before the toss. Begin recording a beat before your hands separate so the setup and rhythm are captured whole. One serve reads cleaner than a basket — fast rally swings in the same clip can look like serves and muddy the read.
60fps or slo-mo if your phone has it. Contact lasts a frame or two; more frames means a cleaner read of a very fast moment.
The two angles, and what each one sees
This is the part most people get vaguely right and specifically wrong: the two useful angles see different things, and neither sees everything.
Side-on — camera at the sideline, level with the baseline. This is the default. It reads your reach at contact, whether the racquet actually dropped behind you, how much your legs loaded and drove, your rhythm, and — only from here — how much you lean into the court as you strike. If you film one clip, film this one.
Behind — camera behind you, aimed at the service box. This reads the things a side camera physically can't judge: how steeply your shoulders stack over each other at contact (the cartwheel that throws the ball up instead of pushing it), and where your hitting arm finishes across your body.
Neither angle is the better one. If a report on your side clip says nothing about your shoulder tilt, that's the camera's geometry, not a hole in your serve — that read lives behind you. Alternate angles across sessions and you cover the whole serve.
What the camera honestly can't see
One thing to set expectations: the tracker follows your body, not the ball or the racquet. So every toss read comes from your tossing arm, not the ball's flight, and the racquet drop is read from your wrist falling below your elbow. That's a feature, not a shortcoming — it means the feedback is about the engine, which is the part you can actually change.
Film two or three serves per session, pick your cleanest one, and let CoachVision read it. Thirty seconds of setup, one honest serve, and your practice stops being a guess about what your arm did up there. That trade is available every session — take it.