3. The company says that the product has many benefits. They say: “Teach your baby a strong work ethic early on in their life. “Baby will get a nice workout, burn off energy, and do muscle toning. And sleep better too!” 5. A spokesman said: “It’s a bit of fun.” The $40 USD item – said to be inspired by a spoof Japanese version – is for sale online at betterthanpants.com .