You'd have to be the worst workaholic ever to be applying Six Sigma/Agile stuff to your personal life.

It feels weird to see Six Sigma implicitly paired with Agile instead of Lean. That said, Six Sigma is generally concerned with much higher quantities than are found in personal life, so yeah that would be nuts. Although, Agile and Lean do both have stuff that could be reasonably applied to personal life.

I mean, putting something on your shopping list when it's running low is basically just Kanban.