"High intensity" means something that is done with a lot of energy, effort, or force. It often refers to activities or exercises that are very challenging or demanding. Full definition
It's a set of high intensity interval training sessions that last 12 minutes from start to finish. (annmariegianni.com)
Standard safety features over and above the norm include reverse parking sensors, a rearview camera and adaptive high intensity discharge headlights that point into turns. (kbb.com)
Finally, we discuss the benefits of high intensity interval training. (naturopathiccurrents.com)