The Real Problems With Wrist-Based Fitness Trackers

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!