Hi, Amy,
I tried to e-mail you, but it came back to me as the wrong address. I was away for a week, and I got your e-mail when I came back yesterday.
I don't have Imax 3, but I do Imax 2 on a six inch step. I am 5'2" tall, and if a workout isn't too high impact, I can do it on an eight inch step. I also found that when I didn't exercise for a week, I ate too much, and I haven't gotten back on track since I started exercising yesterday.
I find that if I am strict with WW, I usually lose about two pounds a week.