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.
We've all read a billion articles on the benefits of high intensity interval training (HIIT). Heck, I've written a bunch of them! I'm a huge advocate for HIIT cardio, but I also think slow, steady-state cardio has its own respective advantages for fat loss and might be better for certain fitness enthusiasts.