In learning three turns, I've found inside ones much harder to master than outside ones. More than once, I have managed to "lose" my inside ones in that I feel terrified to even attempt them away from the barrier. With work, I can get them back - practice them at the barrier with hands on the barrier, then with one hand, then no hands, etc. But I don't have these issues with outside three turns.
Being the analytical geeky type, I find myself thinking about outside vs. inside three turns, and wondering why they feel so different to me. In one sense, it's such a small change - one edge to the other is about 1/4 inch across the width of a skate blade - hold a good edge, rock up higher on the blade, change the body position and switch to the other edge going backwards. One difference that I can spot right away is that the body lean and corresponding body positions have to be quite different - even a modest lean leads to the upper body being quite a different position relative to the blade for an inside edge vs. an outside edge. While typing this, it just occurred to me that with outside edges, the free leg is on the opposite side of the blade as the upper body, so the free leg can be used to adjust your balance, if you feel that you are leaning too much or too little. In contrast, with inside edges the free leg is on same side of the blade as the upper body, so that you have to use other parts of your body to adjust your lean/balance. But, I still feel like I don't truly understand *why* they feel so different.
I'd love to hear hear other people's thoughts or musings on why inside three turns initially feel so much more awkward than outside three turns!