I love Leslie Sansons's walking tapes. They give you some toning exercises along with "walking." Best of all you can do it at home when it's raining. (no snow in TV).
I have one that has a belt with stretchy bands on it. It's good for the abs.
This is the first exercise I've ever done in years.
Here's one of the websites for her tapes.
http://www.lesliesansonevideos.com/