There are a lot of things to consider in tango but one that is rarely mentioned and that should be your foremost concern is that of comfort and your partners comfort.
Yes your initial experiences in tango will take you out of your ‘comfort zone’, possibly both physically and otherwise. The mistake that is made is to presume that that initial discomfort is part of tango. It is not. Tango is fun. Tango is pleasurable. Tango is about pleasing your partner.
So when whoever you are learning from talks about good posture; listen to them. Stand up straight, relax, let your skeleton do the work not your muscles, breath. Then, and only then, embrace your partner. Ask yourself are you comfortable, is your partner comfortable. Even better ask your partner if they’re comfortable. Tango is playtime not work and if you’re making it hard work then you are not doing it right.
Amen.