David Letterman's Late Night couch has become the one-stop shop for celebrity revelations these days, whether it's Mindy Kaling breaking out her trusty Apu impression or Rosie Perez mistaking her co-star for a popular follicle stimulant . Late Show mainstay Richard Simmons at first seems poised for a similar breakthrough moment as he pulls a Tom Cruise, climbing aboard Dave's couch in this clip (preserved after the jump). However, instead of shouting out his adoration for a CW starlet, the exercise guru makes an impassioned plea for...physical education . Head in hands, Simmons' long-suffering publicist put in a reassuring call to Blake Lively ("The plan is still on — I swear!") and booked a romantic do-over on the next episode of Tyra . [CBS ]