Don't you know that they have to write 18 blog posts per hour about all the micro aggressions they were triggered by?  Plus they have to rewatch the Ghostbusters movie 7 times in addition to cutting arm holes in their brand new tarp that they are planning on wearing to the new barbie movie.  During all of that they have to eat every 20 minutes in order to ward off starvation mode.  So as you can see, they have no time to squeeze movement of any kind into their life let alone going to the gym.