Not sure if this counts exactly, but I've worked out using one of the dvd's/vhs in my ever-expanding collection, 2/3 of the days in the month, each month for around 11 years now. But that includes a little bit of everything--step, hi-lo, hiit, weights, pilates, yoga, etc.
Does that make it consistent inconsistency?
My results? I dealt with stress a bit better, so no trail behind me of dead bodies of the people who hacked me off!