- fitMusic: They've got tonnes of workout mixes available. Visit their site to download (right-hand column, under "Download this week's mix") or use iTunes to subscribe. To find it in iTunes, search the iTunes Store for "fitmusic.com fitmix archives."
- Podrunner: My absolute favourite of the two. High-beat and high-quality mixes perfect for running or any sort of exercise. Subscribe through iTunes (easy way) or download them individually from DJ Steveboy's website (click on Podcast archives and then expand the arrow next to each mix). To subscribe, search for "podrunner" in the iTunes Store.
Oh, and if you're new to podcasting, here's a quick tutorial on how to download them with iTunes. Anything more than that, I recommend using Apple's support docs or googling for instructions specific to your mp3 player. I barely know how to get them onto my iPod so I'm pretty much useless for support ;)