I think you're right ... I suppose keeping the back leg straighter would make you feel it more in that leg. Cathe does say something to the effect (in the second side) that with the foot elevated and flexed that you should be feeling it ... implying it's felt in the front leg.I think it depends on how stiff you're holding your back leg. If you have it super straight, you're going to feel it there, too, but I believe the emphasis is supposed to be feeling the work in your front leg. I'd go back and listen to her form pointers during the workout to see what she says about that, though, because I thought she said to keep a slight bend in your back knee.
i love discussing this type of question. Myself have not done this workout yet.I am having trouble understanding this exercise. Should I feel this is the front straight leg that is on the step topper, or the rear leg?