Calm Balloon turns slowing down into a small game. Sit still for 30 seconds while the app learns your baseline heart rate; then the balloon shows your heart rate and a ring breathes at 6 breaths per minute. Keep your heart rate at or below the target (baseline minus 3, 5 or 7 bpm by level) for 30 seconds within 3 minutes to win. Faster wins earn up to three stars. - Targets are relative to your own baseline, so age and fitness do not matter. - Game history, three levels, English and Korean. - Uses only the wrist optical heart rate; a temporary recording session keeps the sensor awake and is never saved. Personal wellness game, not a medical device. Tested on Forerunner 965.