Driven individuals with demanding, high stress lifestyles tend to gravitate toward challenging, high intensity types of exercise. Especially if you don’t have a lot of time to spare. Fitness professionals who offer these kinds of classes or training want to “make it worth your time.” So we do the hardest things. We push ourselves to the absolute limit. After all we can rest when we’re dead.  The problem with this Rocky Horror Fitness Show is that while it may burn calories, it also triggers frightening responses in the nervous system, that without attention can lead to long term physical dysfunctions.