@CNN: Want to be gym trendy in 2018? Do HIIT https://t.co/na2ZWV3eoN (via @CNNHealth) https://t.co/9x4NVlkQry
Want to be gym trendy in 2018? Do HIIT https://t.co/na2ZWV3eoN (via @CNNHealth) http://pic.twitter.com/9x4NVlkQry
— CNN (@CNN) January 7, 2018