I was told by my tango instructor that when doing tango walk (and I'm talking about AT here not AmT) should reach the step with straight knee. So that's what I've been doing, I have to say that it does look very nice and when I went out dancing I often got compliments about having very nice leg extension. However, sometimes I see people dancing with slightly flexed knees when reaching for the step, they look nice too, for example, in the movie Tango, the scene where this couple dancing in a milonga, her knees were slightly flexed the whole time, and it looks equally nice. I'm just wondering if these are different styles? The straight knee looks especially nice when taking large step. Those dance with flexed knees seems to be taking a smaller step. Anybody knows the answer?