If you only change one setting before filming your next session, change the frame rate, not the resolution. For analysing a lift, how often the camera samples the movement matters far more than how many pixels each sample contains.
What frame rate buys you
A frame is a sample in time. The faster the thing you want to see, the more samples you need before it becomes visible at all.
Consider the turnaround at the bottom of a squat, which takes roughly 100 milliseconds:
- 30fps gives you 3 frames of the turnaround
- 60fps gives you 6
- 120fps gives you 12
- 240fps gives you 24
At 30fps you are inferring what happened between frames. At 240fps you are watching it.
Motion blur is the hidden problem
Frame count is only half of it. At low frame rates each frame is exposed for longer, so a fast moving bar smears across the image. When you pause on that frame the bar is a streak, and you cannot say precisely where it was.
High frame rate capture forces a shorter exposure per frame, which produces crisp stills you can actually step through. This is why a paused 240fps frame looks sharp and a paused 30fps frame of the same moment does not.
Which rate for which lift
Match the frame rate to the speed of the phase you care about:
- Heavy grinding squats, deadlifts and bench: 120fps is plenty, the lift is slow
- Speed work and dynamic effort sets: 240fps, the whole point is the fast portion
- Snatch, clean and jerk: 240fps, the turnover happens faster than 120fps resolves cleanly
- Accessory work and general form checks: 60 to 120fps is fine
For velocity measurement derived from video, always prefer the higher rate. Speed is distance over time, so a finer time base directly improves the number.
The storage cost is real
240fps is roughly double the data of 120fps for the same duration and resolution, and 120fps is already four times 30fps. A training session filmed entirely at 240fps will fill a phone quickly.
This is why SetSync defaults to 120fps and treats 240fps as an opt-in: most sets do not need it, and the ones that do are usually the handful of top sets rather than every warm up.
A practical habit is to film warm ups at 120fps and switch to 240fps for working sets and anything you plan to measure.
Resolution: 1080p is usually the right answer
4K sounds better and is mostly wasted here. You are looking at the position of a bar and a few joints, not reading text off a wall. 1080p at a high frame rate gives you more usable information per megabyte than 4K at 30fps.
Many phones also cap the available frame rate at higher resolutions, so choosing 4K can silently drop you back to 30 or 60fps. Check what your camera actually does before assuming.