From the Trampoline Stair Machine to the Self - Impaling Cable Row Machine, you will not believe just how bad some training equipment can be. (hardgainermusclebuilding.com)
At the turn of the century, according to Suzanne Schlosberg, author of The Ultimate Workout Log, primitive stair machines were used for punishment in federal penitentiaries. (si.com)
Mot gyms have stair machines so if you don't have any stairs at home or nearby then you should still be able to do these. (fitbodyhq.com)