If you do a google search on these keywords, fitness workouts podcasts, you'll get a list of citations of different websites that have downloadable fitness podcasts. You'll have to weed through the list to find the free ones because there are free fitness podcasts.
Here's an example www.itrain.com/index.php
This is a free fitness podcast, but not specifically for workouts. www.fitnessrocks.org/
Unless the new Kindle Fire has fitness apps, amazon doesn't list podcasts.
Edited by: ARCHIMEDESII at: 2/8/2012 (10:40)