Amazon does it for me again...
I am retired and I don't get enough exercise but, these slippers are the best.
They help me get a little work out just doing little chores around the house.
Also, if you buy these you will want to buy the size smaller than the whole size.  I normally wear a 6 1/2 and I got the size 7.  They are way to big.  I should have gotten the size 6.