I think that's the exception that proves the rule, though, no?
The majority of strength and cardio exercises are fairly simple to learn. Getting your form 100% correct is certainly more work, but generally not much.
Basic partner dancing can certainly seem fairly simple, but you very quickly move out of that and into the realm of most things being complicated. And even with the basics, if you actually focus on the technique, it's already a lot more complicated than most workout exercises.
I do expect that some forms of martial arts could be comparable (or perhaps even higher) in complexity to partner dance, though. But I'm not sure if I'd consider martial arts to be exercise as much as it's a sport or hobby.
(Source: former competitive ballroom and latin dancer.)
At lower weights, it's easy to 'have good form'. The muscles can easily compensate for each other and one doesn't have to think too much about which muscles to contract/focus on.
As the weight increases, it requires more focus to ensure that you are keeping your form and positioning and even just to engage your muscles `in the right way`. Form becomes more important/a pre-requisite in a way that ramps up as the weight increases as mistakes become harder to correct on-the-fly. The tolerances decrease and so the technique becomes more important.
The majority of strength and cardio exercises are fairly simple to learn. Getting your form 100% correct is certainly more work, but generally not much.
Basic partner dancing can certainly seem fairly simple, but you very quickly move out of that and into the realm of most things being complicated. And even with the basics, if you actually focus on the technique, it's already a lot more complicated than most workout exercises.
I do expect that some forms of martial arts could be comparable (or perhaps even higher) in complexity to partner dance, though. But I'm not sure if I'd consider martial arts to be exercise as much as it's a sport or hobby.
(Source: former competitive ballroom and latin dancer.)