Should couch potatoes be encouraged to use transcranial direct current stimulation?

A very high percentage of the world population doesn’t exercise enough and, as a consequence, is at high risk of developing serious health conditions. Physical inactivity paired with a poor diet is the second cause of death in high income countries. In this paper, I suggest that transcranial direct stimulation (tDCS) holds promise for “couch potatoes” because it could be used to make them more active, without causing any major side-effect. I also argue that other, less safe, tools could be used to achieve the goal of decreasing physical inactivity, insofar as they have overall fewer side-effects than physical inactivity.