I must disagree with you on this one Corndoggy.
Low Impact usually refers to the level of jumping and "impact" on joints, etc, not to the intensity. Some low impact exercises are very high intensity - bike racing/Spin is considered more of a low impact exercise, but is very high intensity. The same goes for step style classes and videos - low impact has less jumping, etc then high impact, but is not necessarily of lower intensity in all cases.