I want to…

“I want to connect my watch or heart rate strap”

FLUX reads heart rate from Apple Watch, Garmin, Polar, COROS, Whoop and any Bluetooth chest strap. Each one has its own guide inside the app, because each one connects differently.

1. Open Connect Your Device from the dashboard.
2. Tap your device from the list of eight.
3. Follow the three steps on screen. Apple Watch needs no pairing at all — just allow Health access and FLUX reads from there.
4. For a chest strap or Garmin, put it on first, then tap Scan so it's broadcasting when FLUX looks for it.

Nothing to connect? Skip it. FLUX will track your cadence from your phone instead and match music to your stride.

“I just want to go for a run, now”

One button, one sheet, and you're out the door. Automatic is the default and needs no setup — the music simply follows whatever sync source you have.

1. Tap Start Live Sync on the dashboard.
2. Leave the mode on Automatic.
3. Under Sync Source, pick what's driving the music:
   • Heart Rate — music follows your HR zones, calculated from your personal Karvonen profile.
   • Cadence — music BPM locks to your steps per minute. No watch needed.
   • Free Run — music plays from your filtered pool without reacting.
4. Hit Start and put the phone away. FLUX changes tracks on its own.

“I only want music from the zones I choose”

Doing an easy recovery run and don't want a sprint track showing up? Zone Only pins the music to the training zones you pick, and nothing else gets played.

1. Tap Start Live Sync, then choose Zone Only.
2. Tap the zones you want — Warm Up, Easy, Steady, Tempo, Sprint. Pick as many as you like.
3. Check the live count underneath. It tells you exactly how many tracks in your library qualify before you commit.
4. Hit Start.

Your Sync Score still runs in Zone Only. It measures how well each track matched you — not whether you followed a plan.

“I want to build my own workout”

Intervals, tempo blocks, warm-up and cooldown — build the session yourself and the music follows the structure instead of your heart rate.

1. Go to the Workout tab and start a new workout.
2. Choose the sport — running, cycling, walking, strength or jump rope.
3. Add segments one by one: Warm-up, Base Run, Interval, Sprint, Cooldown, Breathe or Rest.
4. For each segment set a duration and a target BPM range. That range is what FLUX matches music to.
5. Choose manual or automatic advance between segments, then save — or send it to someone else.

“I want the AI to build my workout”

FLUX Lab takes a goal and turns it into a full structured session — segments, durations and BPM targets — and drops it straight into the builder so you can edit anything before you run.

1. Open FLUX Lab from the Workout tab.
2. Pick your starting point:
   • Workout First — describe the sport, the goal and how long you have.
   • Music First — pick a vibe and let FLUX Lab build the session around it.
3. Review what it built. Every segment is editable.
4. Save it, or run it right away.

“I want the track to start at the drop”

Some tracks take forty seconds to get going. On a sprint interval you don't have forty seconds. Drop Sync marks the exact moment a track kicks in — and FLUX starts it there.

1. Open the Library and find the track.
2. Long-press the row to open the drop point editor.
3. Scrub to the moment the track actually hits and set it.
4. From then on, whenever FLUX plays that track mid-run, it starts at the drop.

A pin icon on a library row means a drop point is already set.

“Why is my library still loading?”

The first time you connect your music, FLUX tags every track with a BPM and an Energy Score. That's the data the whole sync engine runs on — and it only happens once.

1. After connecting Apple Music, open the Library. A green banner shows the progress — how many tracks are left.
2. Keep FLUX open until it finishes. Tagging runs while the app is active; a big library takes a few minutes.
3. You don't have to wait for all of it — tracks drop into their zones live, as they're tagged, and anything tagged is already runnable.
4. When the banner disappears, you're done. From now on only new tracks get tagged, in seconds.

Added new music? Tap the refresh icon at the top of the Library and FLUX picks up the new tracks.