We got these from Ikea and installed them for Sage to burn off some energy. Also, got her this bike, which she is thankfully pretty into. She doesn't "get" pedaling yet, but we wanted her to be able to get around. She just uses her own feet to move the bike, and can lift them up when she gets going to learn balance. She is finally willing to wear a helmet too! This girl has got so much energy, I am hoping these things help channel some of it.
Check out Fern in the middle of her "Old Man" laugh.