www.cardiocoach.com is having a sale - $4.95 for each workout - they are normally $20.00, so it's a great deal.

I know these are not cycling specific workouts but I use them on my bike/trainer all the time. They are great interval workouts for your iPod or other mp3 player. They range from 30 minutes to over an hour - and believe me will make your time on the trainer fly and get you covered in sweat in the process.

And I have no affiliation what-so-ever with Coach Sean. I just think these are great workouts for days you cannot get outside.