Sesame Street season 53 episode 21
Grouch-ercise
Oscar's been feeling terrible all day, so Elmo, Abby, Grundgetta, and Nina try to find different exercises to help him feel better. As they set off to tell Oscar all the exercises they came up with, they find him returning from a long, grouchy walk picking up trash. Oscar feels much better and is back to feeling good and rotten.