Mouseclick: "Implying make your own mind up, read the books, but ultimately listen to your mind and body, not the people around you. So if you are curious try fasting and working just to see what it's like, but don't go into it hell bent on doing x days. Just be guided by your body."
I'm with you on this too Mouseclick.
I did the same with experimental heavy cardio in a fast (i think for the first 4 days). To tell you the truth, the exercise itself was going fine, but i felt "very" stressed at bedtime and upon awakening, instead of experiencing the beautiful relaxed state i had grown to love about fasting. Now i believe all the folks that were saying it shouldn't be done ;)... but now i know it from first hand experience and was thus able to remove any and all nagging doubts :).