Coach the workout live
Receive voice and vibration cues while you can still adjust your effort—not only analysis after the session.
ZoneCue Cardio COROS · Free Android beta
Turn your COROS into live cardio guidance.
The COROS Heart Rate Monitor and compatible COROS watches can broadcast live heart rate over Bluetooth. ZoneCue Cardio turns that signal into proactive voice and vibration guidance while you train.
Requires Android and a COROS Heart Rate Monitor or compatible COROS watch actively broadcasting heart rate over Bluetooth.
LIVE WORKOUT
18:42132BPM
ZONE 2Dialed In
TIME IN ZONE14:08
ZONE DISCIPLINE92%
GOAL30 min
COACHING CUEDialed In
01
COROSBroadcasts your live heart rate
→
02
ZONECUEMonitors your target and goal
→
03
YOUHear when to push or ease up
Connect COROS
From live heart rate to live guidance.
Requires Android and a COROS Heart Rate Monitor or compatible COROS watch actively broadcasting heart rate over Bluetooth.
- 01
Activate your COROS Heart Rate Monitor, or open the toolbox on a compatible COROS watch and select Broadcast HR.
- 02
Open ZoneCue Cardio and select the broadcasting COROS device from the sensor list.
- 03
Choose your workout structure, target zones and goal, then start training.
What ZoneCue adds to COROS
Keep the sensor you trust. Add coaching built for the workout.
COROS provides capable training, recovery and performance analysis. ZoneCue adds a focused Android coaching layer that responds to the live Bluetooth heart-rate signal throughout the workout.
Anticipatory zone guidance
Get an early prompt before or as you cross a target boundary so corrections can stay smooth.
Choose your methodology
Use maximum heart rate, heart-rate reserve or fully custom zones that match your training plan.
One workflow across sensors
Keep the same goals, workout structures and coaching experience if you change compatible hardware.
One community. Many sensors.
Help build cardio coaching that works across devices.
ZoneCue brings users with different sensors into one beta community. Together, testers can share what works, identify connection differences and shape features around real workouts—not one hardware ecosystem.
Join with COROS →Learn across devices
Compare zone strategies and workout structures with people using different sensors.
Improve compatibility
Report real connection behavior so support can become broader and more reliable.
Shape the roadmap
Help prioritize the coaching, goals and insights that matter during actual training.
Learn your zones
Why Zone 2 matters
Your body uses a mix of fat and carbohydrate for energy during cardio. As intensity rises, that balance gradually changes—it is not an on/off switch.
EffortThe gas pedal
Heart rateThe dashboard gauge
Fat + carbohydrateThe fuel sources
MitochondriaAerobic engines inside your muscle cells
ZoneFat contributionCardio stimulusWhat it means
Easy and sustainable. Useful for recovery and adding activity volume.
Substantial fat contribution, meaningful aerobic conditioning and sustainable for longer sessions.
A stronger tempo effort as carbohydrate demand begins to rise.
Hard threshold work with greater reliance on glycogen and faster fatigue.
Near-maximal, carbohydrate-dominant work that is difficult to sustain.
The useful middle ground
The Zone 2 sweet spot
Zone 2 is hard enough to provide a meaningful aerobic stimulus, moderate enough to maintain substantial fat oxidation and easy enough to sustain. With consistent aerobic training, your mitochondria (aerobic engines inside your muscle cells) can become more numerous and efficient, helping you produce more energy aerobically and do more work at the same heart rate.
Zone 2 is not the only valuable training zone. It is simply one of the most practical places to build your aerobic foundation.
Keep the distinction clear
Fat burning is not the same as fat loss
A workout can emphasize fat oxidation without guaranteeing a loss of body fat. Long-term changes in body fat also depend on overall energy intake and expenditure over time.
Heart-rate zones are estimates and vary by person, method and device. This lesson is general fitness education, not medical advice.
Further reading: fat oxidation and exercise intensity · exercise and mitochondrial adaptation
Join the tester community
Two workouts. Fourteen days. Honest feedback.
- 1
Join the closed Google Play test using the Google Account email in your application.
- 2
Complete at least two cardio workouts and test the COROS connection and coaching cues.
- 3
Tell us what happened—including bugs, confusing moments and features that helped.
Limited beta
Ready to put your heart-rate data to work?
We’re looking for a mix of Android phones, heart-rate sensors and cardio routines. The beta is free, and every current feature is included.
You’re a good fit if you:
- ✓ Use an Android phone
- ✓ Have a compatible broadcasting sensor
- ✓ Train with heart-rate zones
- ✓ Can test during two or more workouts
Prefer to wait?
Get notified when ZoneCue Cardio launches.
Interested, but not ready to beta test? Join the launch list and we’ll let you know when the Android app becomes publicly available.
Please read before applying
Beta and exercise disclaimer
ZoneCue Cardio is beta software intended for general fitness and informational purposes only. It is not a medical device and does not provide medical advice, diagnosis or treatment. Heart-rate readings, alerts and workout guidance may be delayed, interrupted or inaccurate. Consult a qualified healthcare professional before beginning or changing an exercise program, and stop exercising if you experience pain, dizziness, unusual shortness of breath or other concerning symptoms. Participation is voluntary and use of the beta is at your own risk.
ZoneCue Cardio is an independent app and is not affiliated with or endorsed by WHOOP, Polar, Garmin, Wahoo or Orangetheory Fitness.