Agree the question before filming
Ask the coach what to look for and whether filming is appropriate at the venue. Get permission where required and respect other people’s privacy. Avoid collecting footage just because the camera is available.
Watch in a manageable sequence
Start with the whole attempt and identify the moment relevant to the coaching question. Ask for an explanation you can relate to what you felt. A freeze frame without context can make a normal part of a movement look like a separate problem.
Take one cue back to the water
Write down a clear instruction and check that you understand it. Avoid carrying a list of body-position corrections into the next ride. If the cue does not make sense in practice, discuss it rather than trying to force a movement from a still image.
Use footage to support a longer view
Compare sessions only when the context is reasonably understood: equipment, wave and task. Keep a small record of useful clips, not an obligation to film every visit. Feedback should make the next session clearer, not turn every ride into an examination.