There are slippers called “diet slippers/sandals” in Japan. They are popular in women here.
Those slippers have shorter soles and higher heels. When you wear them, there is nothing under your heels. Hence you need to raise the heels while you are wearing the slippers.
As you can imagine by now, those slippers make you raise your heels and by walking like that your legs get exercised. Those slippers even make blood circulation in your legs and feet better.
Since those slippers are inexpensive and easy to get, many women wear them while they are cooking and cleaning.