Want to give your workout a boost with music that's mixed for speed, strength, focus, or intensity? Podcasts that rock your workout are all the rage right now and the best thing about these mixes is that they're free and easy to download! Check out these picks all available through itunes and find exactly what you need to boost workout productivity.

podrunner creates fast paced techno style mixes for running, spinning, kickboxing, or any other fast paced activity. The mixes range from 130 beats per minute all the way to 180 beats per minute and the music is very upbeat and at times insanely fast which is great for zoning out on a cardio machine. If your cardio or circuit training workouts lack intensity then these downloads will light a fire under your butt and get you moving. Awesome ones to try:
Rainy Day Run: great mix for the Look Great Naked Workout
Body Language: killer mix for spinning or elliptical nirvana.
One Tribe: awesome mix for the Weightloss Exercises Workout.

fitpod.com creates mixes for all type of workouts from strength and cardio to yoga and pilates. The mix descriptions are detailed which makes it easy to find something that appeals to you and fits your workout. Try to sample mixes before downloading and keep an open mind. What may be described as a great running mix can work for a yoga workout and mixes that were created for yoga can also work for walking or more focused core training. Check out my favorites below.
A Walk In The Park: great for a walk/run w/ pushups and crunches to finish.
Slipstream: perfect for a full body workout with lots of cardio intervals.
Bamppot Booty Mover: awesome for a fun vigorous yoga workout:

exerciseradio.com offers four workout channels including cardio, strength, kickboxing, and yoga. You can access the music channels through real music or through itunes. No downloading just workout music 24/7. The yoga channel has varied bmp, the kickboxing channel is typically in the 140 bmp range, the strength channel in the 120 range, and the cardio channel is in the 130 bmp range. The only downside here is that you have no options as far as downloading or playing what you like. If you aren't into what's on then just check back later and the mix will be different. Favorite picks here:
Strength channel - always fun always upbeat and diverse for most full body workouts, ab workouts, jump rope workouts, and treadmill walking.
Yoga channel - is very hit and miss but when it's on it's on fire. If you're dying to zen out and the channel isn't working for you a good alternative is groove salad on somafm under ambient streams in itunes radio.

Get an ipod and burn more calories! Best one to get for podcast workouts, iamplify workouts, or pumpone workouts is the
Apple 30 GB iPod video Black (5.5 Generation)