The Square Master
First off, if you don't remember the Square Master invention from Warrior of the Lost World that parodied the then current Stair Master, here is a link to it, it appears at the 2:30 minute mark. https://www.youtube.com/watch?v=1m66b9H724Y
Pretty dumb huh, A great parody of the pointless exercise equipment that does things you can do anywhere for free that came out in the 1990's. I am sure glad no one has seriously come out with anything as useless as the ultimate in pointless exercise equipment, the Square Master. https://www.youtube.com/watch?v=UZE2tHRlA9k