Your phone's accelerometer already measures every stride and rep. Shake mode reads that motion intensity and maps it to media volume inside your chosen range: sprint and it climbs toward your ceiling; walk the recovery and it settles back down. The effect is a soundtrack that mirrors effort — an energy boost precisely when you're working hardest.
Hands-free volume boost for running and workouts
Mid-interval is exactly when you want the music louder and exactly when you can't spare a hand. Shake mode ties your volume to your movement — the harder you go, the harder it plays.
01How movement-based volume works
02Set it up before your next session
- Choose Shake mode
- Set the volume range — quiet enough for rest periods, loud enough for max effort
- Run the shake calibration with the phone where you'll carry it (armband, pocket, belt)
- Start your playlist and go
03Placement changes the feel
Calibrate for where the phone lives: an armband transmits arm swing strongly (lower sensitivity), a waistband reads cleaner cadence, a loose pocket adds bounce (raise the threshold so fidgeting doesn't spike the volume). Thirty seconds of jogging on the spot during calibration gets it right for your setup.
04Gym, intervals and outdoors
Interval training is the killer use: work sets get the push, rest periods automatically give your ears a break — better than static max volume for the whole hour. Outdoors, note the trade-off with Noise mode: shake tracks your effort, noise tracks the world's. For city runs where traffic matters, noise mode may serve better; for the gym and the track, shake wins.