Track + artist
What was playing on the phone or Watch when the set was logged.
Music mode
Did "Eye of the Tiger"
Did "Eye of the Tiger"
actually help your bench?
We don't know either. But after a few months of training, we can show you the songs that were playing the last twelve times you set a PR. Make of that what you will.
Apple Music native Per-set track tagging Opt-in
Your top five PR catalysts.
Songs that were playing when you hit a new max, ranked by frequency. Take this with the affectionate skepticism it deserves.
#
Song
Artist
BPM
PRs
Most often during
1
Otherside
Red Hot Chili Peppers
99
8
top sets · squat day
2
Black Sabbath
Black Sabbath
73
6
heavy singles · deadlift
3
Run This Town
Jay-Z
79
5
walk-up · bench
4
Civilian
Wye Oak
145
4
warmup pace
5
Caribou
Pixies
119
3
back-off sets
Four light fields, one tap to enable.
The minimum metadata to make the leaderboard meaningful. No audio. No lyrics. No cloud analysis.
Position in song
Where in the track you logged. Useful when the same song appears in warmup and PR territory.
Tempo (BPM)
Pulled from Apple Music's metadata. The song's BPM, not yours.
Album + year
Lightweight provenance — so "Otherside" doesn't collide with the eleven other songs of the same name.
More fun than it has any right to be.
None of these will appear in a textbook. All of them will make you smile the first time the chart loads.
PR catalyst rankings.
After a few months of logging, the music tab shows which songs appear most frequently when you set new PRs. Ranked. With small confidence chips so you don't take it too seriously.
Tempo × intensity scatter.
Plot the BPM of what you were listening to against the RPE of each set. Some lifters need 130+ BPM to hit top sets; others train heavy to mid-tempo rock. Yours will surprise you.
Session soundtrack.
The full track list of any given workout — overlaid on the rhythm waveform so you can see what was playing at each peak. The deadlift PR over a Joe Cocker bridge will become a personal artifact.
Auto-generated PR playlist.
Spin up an Apple Music playlist from the songs that show up most often in your PR sessions. Take it to the next gym. See if the magic travels.
Sample chart
Tempo × intensity, drawn from your sessions.
Each dot is one logged set: the X-axis is the song's BPM at the time of the set; the Y-axis is the set's RPE. Patterns emerge fast. You may discover you train heavy to mid-tempo rock, or that PRs only land above 120 BPM, or that none of it matters and you can lift heavy to opera.
Either answer is interesting. Neither is a verdict.
TEMPO (BPM) × RPE 42 SETS · 4 WK
Working set PR
Play. Pause. Skip. Without dropping the bar.
Music controls live on the Lock Screen, the Watch face, and the AirPods stem. On iPad, every action has a keyboard shortcut too.
Play / pause ⌘ +⏯
Next track ⌘ +→
Previous track ⌘ +←
Open music browser ⌘ +M
Toggle music tracking ⌘ +⇧ +M
A reminder that this is for fun.
We built this because tracking songs alongside lifts is genuinely entertaining. We did not build it because we believe a particular Red Hot Chili Peppers track caused your deadlift PR.
This is correlation, not causation.
No song is making you stronger. Some songs reliably show up when you're already in the mood to be strong. The data is honest about that, and so are we.
Small N.
A "PR catalyst" with three PRs to its name is a fun fact, not a study. We label sample sizes plainly so the leaderboard reads as the entertainment it is.
Some songs are warmup-only.
The chart filters out tracks that only ever played during your first ten minutes. The "favorite" song you only hear at the warmup rack is not your PR catalyst.
What music tracking is not.
It is light, opt-in, and on-device. None of the catches usually attached to listening data apply here.
Track metadata only. No audio.
flexRep stores the song name, artist, album, and Apple Music's public tempo metadata. It does not record audio, does not analyze your library, and does not read lyrics.
No cloud listening service in the loop.
Track info comes from MusicKit on your device. Nothing about your listening habits leaves your phone except in the export you choose to take.
Opt-in, on a per-workout basis.
Music tracking is off by default. Turn it on in Settings, or per-session from the workout header. We thought hard about whether to make it on-by-default; we decided you should choose.
In the export
Songs travel with your sets.
Music tracking adds light per-set columns to the CSV and a small music object to the JSON. If you ever want to take your PR playlist analysis to a notebook — or hand it to an LLM and ask which song-genre best predicts a top set — the data is there.
Find your catalyst.
We can't promise it'll work. But the correlation is real, and the playlist is yours.