TL;DR. A form check fails at the phone, not the lift: walk over, hit record, walk back, lift, walk over again, stop, scrub. With a rolling buffer the phone sits on a tripod side-on at hip height and you save after racking the bar, from your watch or with an open palm toward the lens. A 12 to 15 second buffer holds a heavy single with setup and walkout; the free 45 second buffer holds a full set of five. Review bar path at 0.5× before the next set, while the rep still has a feel attached to it.
Between heavy sets you have a rest interval to hit, not a camera to operate. Start-stop filming adds two phone trips per set, and under fatigue the second trip gets skipped, exactly when form breaks and footage matters most.
Depth that feels below parallel is an inch high. A hinge that feels neutral has a rounded start. Video is the only honest referee, and it works best inside the session, while you can compare what you saw to what you felt and adjust the very next set.
A camera running in a commercial gym inevitably catches other members. A rolling buffer overwrites everyone within seconds unless you save, and saved clips stay on your device, no cloud, no account, no accidental publication.
The default angle for squat, deadlift, and bench: bar path, hip hinge, depth, lockout, all readable. Prop the phone on a small tripod or against a plate stack. For squats, an extra session from 45 degrees front shows knee tracking; alternate angles between sessions rather than chasing both at once.
A heavy single with walkout is done inside 15 seconds; our replay delay reference uses 12 seconds per weightlifting rep. A set of five fits the free 45 second buffer: rack, tap the watch, the whole set is one clip. Olympic lift complexes and EMOMs fit a 90 second Pro buffer.
Watch tap after racking, or the open-palm gesture (Pro) straight toward the lens, no touchscreen fight with chalked hands. The buffer keeps the seconds before the trigger, so the set that just ended is always captured. Stealth mode keeps the screen black on the tripod, saving battery and attention.
Scrub the sticking point at 0.5×, decide one cue, lift again. Pair the video loop with logging: track load, reps, and per-set difficulty in Personal Trainer, our offline gym tracker, and let its progressive overload engine decide the next jump while ReplayR shows you whether the last one moved well.
Lifting standards background: Powerlifting, Wikipedia. Last verified 2026-07-19.
The stock camera records everything from the moment you press the button, which is the wrong direction: the moment you want is behind you, not ahead. It fills storage with rest intervals, needs a hand free to operate, and offers no wrist trigger. A rolling buffer records the same seconds continuously and keeps only what you claim after the fact, so a two hour session produces eight clips of lifting and zero minutes of you staring at your phone deciding whether it is recording.
Run ReplayR's rolling buffer and trigger the save hands-free: tap your Wear OS watch after racking the bar, or hold an open palm toward the camera (Pro). The buffer keeps the seconds before the trigger, so the set you just finished is in the clip. The phone stays on its tripod the whole session.
12 to 15 seconds covers a single heavy rep with the setup and walkout. A set of 5 fits comfortably in the free 45 second buffer; save once after racking and the whole set is one clip. Long EMOM or complex work fits a 90 second Pro buffer.
Side-on at hip height, 2 to 3 metres back, is the default: it shows bar path, hip hinge, depth, and lockout. Add a 45 degree front angle for squats to catch knee tracking. Film at 60 fps if the gym light allows; it makes 0.5x slow motion smooth for bar speed checks.
Yes. ReplayR is on-device only: no account, no cloud upload, and the rolling buffer means bystanders walking past are overwritten within seconds unless you save. Stealth mode keeps the screen black while recording, so the phone on a tripod draws no attention. Check your gym's filming policy all the same.
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