Fitness bracelets tend to move around your wrist. Movement of optical sensor can disrupt accuracy. There is hard to imagine any activity that will keep wrist wearable stable at all time.
Tying it too tight and can interfere with blood flow, too loose - space and air can prevent the optical sensors from capturing your heart rate at all.
There Must Be A Better Way!
capture BPM. This process uses a light
sensor on the AIO device, the process
analyzing the amount of light retracted
off flowing blood.
the sensor in place with optimal pressure
at all time, no matter what activity is
chosen. The result is improved reading
This also goes for tasks you perform in your every
day life like cleaning, gardening, and dog walking.
which your body expends energy. So the higher
your MET, the more calories you burn per minute