In the music video for “All About That Bass,” Meghan Trainor bumps and grinds against a pastel background and brags about not being thin: “Yeah, it’s pretty clear, I ain’t no Size 2./But I can shake it, shake it, like I’m supposed to do.”

Dancers abound, including a 420-pound Polynesian man from Orlando, Fla., who hams it up, going into a pirouette and then landing on the floor in a full split. Two young girls play with a Barbie doll until Ms. Trainor tosses it across the room, saying, “I won’t be no stick figure Barbie doll.”

In another video, for “Try,” a number of women wipe the makeup off their faces as the singer Colbie Caillat implores them to stop being so focused on their images.

And in Sara Bareilles’s “Brave,” the cameras jump from a stocky man dancing around a library to an average middle-aged guy in workout gear rocking out at the gym as a bunch of fitness fanatics look on.