HeartFan

Control your homekit devices during a workout.
HeartFan allows you to control your fans and lights within your house based on your heart rate. This can be especially useful for indoor sports where you want your fan to go up when you start sweating. Also controlling the light when reaching your limits gives you an immersive extra motivation. 
Simply add the accessories, press start and go!
The following services and data is accessed by the app:
HealthKit:
• Read Resting Heart rate (Optional, by default 60, used as minimum default control value 0%)
• Read Date of Birth (Optional, by default 30, calculates the maximum heart rate based on your age, used as maximum control value 100%)
• Read Heart rate (To read heart rate during the workout and control your HomeKit accessories between your min and max control value)
• Read/Write Workout (To start a workout)
HomeKit:
• Control fans that have dynamic speed enabled.
• Control lights that have brightness enabled.