Lack of physical activity is global problem, being at the heart of many health issues. Of course, one can go for a jog. However, for some this is too "time-consuming" or requires too much willpower. An alternative is to find opportunities for more activity in daily life. Intervator is a "parasitic" elevator control panel placed on top of the existing panel. When people press the button of their destination floor on Intervator, it actually operates the button of one floor below. Now, either use the stairs for the last floor or cheat the system.