the short answer
To run a remote form check, set the client up to film one clean clip - a side angle, the full rep, a working weight - sent into the chat as a video message. Then watch it twice, diagnose the root cause, pick the single most important cue, and screen-record your feedback over their footage so they see the exact frame and hear the fix. One correction per clip, confirmed on the next attempt, is what changes the lift. Coachway carries this loop end to end: clients send video from the client app, you screen-record feedback into the same chat, and every client sits in Power Panel.