The emphasis is now more and more with my posture. Without being really aware of it, I still dance with my upper body quite a lot, especially when I have to throw my pointed legs up in the air.

The problem comes down to two main factors: one is just pure physical strength, the other is just awareness.
With posture the shoulders are mentioned as well: I still have them hanging forward for a good bit, while they should be held back (shoulders back, chest out)

I decide to pay extra attention to this the coming week. At work, I just try to remind myself as often as possible to push my shoulders back and my chest out, to hopefully make it into a habbit of doing so.

I also notice that when I do push my shoulders back, have my arms straight beside my body ánd keep my chest out, dancing gets a bit easier.

By now, I am starting to have a problematic muscle as well. A muscle in my lower left leg protests after about 10 minutes and I really need to stretch to ease things down there.
Problems get worse when my warm-up is bad. The teacher notices it, but isn't really surprised: every dancer has a problematic muscle.