I don't doubt there's a psychological aspect. But for me personally, it is pretty demanding physically. Not the same way as running or deadlifting might be, to be sure. But keeping good posture and being on axis on 4-inch stilettos while twisting, turning, and basically doing lunges on the balls of your feet? Not so easy. Don't get me wrong, tango shoes look fantastic, but I think they really put the follower in a mechanically disadvantageous position.
I have a whole laundry list of things that I think might improve my tango. Here's some of them:
- foot and ankle strengthening and stretching exercises. Because really, when you look at the skeleton of the foot, it's obvious that the heel is the strongest part and the toes are pretty small and frail. Yet a lot of people tell me to "massage the floor with my toes"... I'm reading up on ballet training for this (suggestions welcome!), since it seems they would have good progressions to lead you into dancing en pointe.
- hip mobility, because how much I can extend the leg depends on my hip range of motion. It's really easy to compensate from the lower back when the hip socket is stiff, which leads to a lot of lower back pain.
- lat and oblique strengthening. I've been struggling with pivots for a long time and I still never feel stable and confident in them. Trying to piece together which muscles generate that rotational motion is pretty much a guess, since I have no training in anatomy or body mechanics, but for now I'm guessing lats and obliques would be important.
- posterior chain in general (hamstrings, glutes, back, calves etc). Because I sit at work, I think I spend a lot of time in flexion. People in the fitness industry believe this leads to tight and overactive hip flexors, rectus abdominus, pecs etc, and weak posterior chain in the general population. Since followers mostly walk backwards, I figure the stronger the posterior chain, the more stable and stronger the walk.
- thoracic mobility. Oh boy.

This annoys me a lot. Dissociation is such a big part of tango, yet I think a lot of us are very stiff in the upper back and have very limited range of motion there. But if I don't dissociate enough or if I'm not comfortable in that end range of motion, it throws me off axis or it forces me to disconnect from my partner (impossible when in close embrace; there I just suffer

). I think many people, myself included, push for dissociation by getting some of it from the lower back. The problem is, this hurts the lower back. There's strong consensus in the fitness industry (see Dr. Stuart McGill's work) that the lumbar region should be a region of stability, and flexion and rotation should come from the thoracic region.
Phew... Turned a little ranty there, sorry... That's actually a shortened list of my hypotheses and speculations. I wish someone had an actual anatomic guide to tango. Metaphoric cues from instructors are ok, but I think I could work much more efficiently towards my goal if I knew what I was doing.