Smartphones may replace fitness tracking devices

Smartphones may soon replace wearable fitness trackers by reliably measuring your heart and breathing rates even when they are kept in pocket or a bag, MIT researchers say.
Researchers are working on a project called BioPhone that could track biological signals using the smartphone’s accelerometer, which can capture the small body movements that result from the beating of your heart and rising and falling of your chest.
This data is collected when you are not moving much – this makes