Why are the workouts under 15 minutes?
The MP3 Workouts that are approximately 10-15 minutes long were designed by MARINA to be “piggybacked”. In other words, you choose which workouts you want to do and play them one after another. You can design a workout of any duration. We have over 100 choices of Walking Workouts alone. The shorter lengths also allow for fast download times and smaller amounts of hard drive storage on your computer, iPod or MP3 player.
