It's a set of high intensity interval training sessions that last 12 minutes from start to finish. (annmariegianni.com)
So the cardio you should be aiming for high intensity interval training, even better reasons for doing this type of cardio is that you wont have to do the session for so long. (fitbodyhq.com)
This could mean lifting more weight or doing high intensity interval training workouts. (verywellfit.com)