We like to refer to Eleanor's Johnny Jump Up as her "Johnny Dance Up."
1) We don't really care that it's gender-specific, and don't think it will warp Eleanor's mind to have a Johnny instead of a Jenny.
2) She doesn't really jump. She doesn't use both her legs together, but rather flails them both about separately, and spins herself in circles.
After much observation, I think she actually does this on purpose, because she enjoys it more than simply bouncing up and down. Pair it with her favorite Cake song, and she's a dancing machine!