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
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