I don't usually like tennis shoes, but these are very very comfortable.  I think they're terribly ugly...but I have been wearing them daily anyway because they feel so good.  I've been doing aerobics in them, and wearing them all day doing housework, lifting, etc.  They do throw balance off just a bit, and I can't say too much about their "toning" properties....but they feel great on my knees, hips and back.  I anticipate these making pregnancy feel a lot better next time.  I'll buy these again when these wear out...in a more neutral color hopefully.