The balance theory in teams or groups refers to the study of the special sets.

Genic balance theory is discovered by american scientist Calvin Blackman Bridges

push-pull theory

It really depends on how you look at the importance of work-life balance. There are different theoretical approaches to understanding the importance of work life balance. However, I think the question asks about the psychological theory that best applies to work-life balance and understanding work-life balance. And that would be Erik Erikson's Life Stages Theory.

Respect formed between guards and prison leaders to keep a balance.