The question of whether people are well because they are active in late adulthood or active because they are well is a constant focus on activity theory research.
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Activity theory, which has its origins in the Soviet psychological activity theory developed by Sergei Rubinstein in the 1930s, is a catch-all phrase for a series of diverse social sciences theories and research.
Later, Alexei Leont'ev promoted it and made it popular. Some of the early indications of the idea might also be seen in a handful of Lev Vygotsky's writings.
Activity theory is less of a predictive theory and more of an explanatory meta-theory or framework. Beyond just one actor or user, it takes into account a complete work/activity system (including teams, companies, etc.). It takes into account factors including the surroundings, a person's past, culture, the function of an object, incentives, and the complexity of actual behaviour.
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