I moved house last week. It was a bit of a marathon and I was taking boxes and crates up to our new flat until far too late at night. It's a great flat and a good move, but the unaccustomed lifted has shown up a weakness.
I strained a muscle in my mid-back region. I've just got back from my physiotherapist, Sonja Bass. Having freed up the muscles she did some posture work with me. What she was showing me is that I try and lift from my mid-back, not my hips and legs, so I don't use my centre (hara).