Check your grammar now! : intense or paroxysmal excitement; especially : the rapid pleasurable release of neuromuscular tensions at the height of sexual arousal that is usually accompanied by the ejaculation of semen in the male and by vaginal contractions in the female.
So, even though you may have only burned 250 calories during your HIIT workout, the total calories burned after will be far greater. Those calories, plus the 250 burned during the HIIT workout surpasses the 400 burned during the slow, steady-state workout by a LONG, LONG way.
Obese, pregnant, or elderly trainees can also benefit from doing steady-state cardio instead of HIIT. If you're new to the fitness world and aren't sure which cardio style is best, spending 45 minutes on the stationary bike is probably a better starting choice than all-out sprinting.