i did it as a beginner and followed anita, who modified the exercises. i also came up with a few modifications of my own for moves that were too hard. by the second week i didn't need my own modifications and by the 3rd (i stayed with level one until i was comfortable with it) i didn't need anita's either.
while i was really happy with the change in muscle tone i saw, i was not happy with the scale. i gained 5 lbs in three weeks. i know it was muscle, but i thought after the 1st week you were supposed to start seeing the scale drop. since weight loss was my goal at the time, i stopped.
the second time i did it, i only did it for 2 weeks and saw no difference and got really bored with it. i'm going to wait about a month or so and try it again. hoping since i changed my diet, maybe it'll help this time. i love jillian and really want to see this work for me