There are times when I get terribly annoyed by Perky Fitness Chick. She repeats herself across her videos, and she's always very, very enthusiastic.
But as I was collapsed after a 2 mile workout yesterday (there are some other movements in there to keep things mixed up), it occurred to me that following the program allows me to turn my brain off for at least a little while. Sometimes when I'm out for a walk by myself my brain starts to interfere. Letting Perky Fitness Chick do the thinking while I try to keep up is actually kind of helpful.
And you wouldn't want Dostoyevsky leading your workout.
(2 miles yesterday, 1.5 this morning with a new tape which goes much faster.)