Import a video from your camera roll. It opens ready to step through frame by frame, and you can trim it to the part you want.
Slow-motion videos keep every frame. Nothing leaves this device.
Keep the golfer and the whole club in view, with the phone steady and level.
Keep Swing Lab open while recording. Recording stops at 5 minutes.
Recording here is normal speed, up to 30 fps. For slow motion, record in the Camera app and import the video.
Use a tripod or steady support, and leave room above and beside the golfer for the whole club. The framing guide shows only here; it is not saved in the video.