Dont fool by the title fo the episode, as deligated to a B plot that used for lame jokes and a plot that goes nowhere. While the main plot is another overused story of Marge and Homer having marital issues but this time Marge becomes addicted to her online exercise bike and homer becomes jealous of how close she is to her instructor.
The shows done this plot more then a few times, which is something the writers forgot about considering the show is on its 34 seasons. As a result both the A and B plot are duds. Both having barely tolerable jokes and making even the coherency of the plot seem senseless as if the people making the episode didn't know how to end either of the stories and was just going off the premise.
Its a forgettable episode, the kind that honestly really cements the fact this show has long since lost its touch.