When using this app from a device with a text-to-speech function such as Google Home, it reads out the interval time of tabata training. Tabata Protocol is the popular and effective exercise method. You just do 8 intervals of 20 seconds all-out intensity exercise followed by 10 seconds of rest. URL of the paper: https://www.ncbi.nlm.nih.gov/pubmed/8897392 Welcome your feedback via Twitter DM. Twitter -> @87Rhander