This is the 646th most frequent Korean word.
생활을
"생활을" means "life" or "living" (in the accusative case).
In this sentence, '생활을' refers to the type of life one leads, specifically the urban life the speaker is experiencing.
나는 도시 생활을 즐기고 있어요.
I am enjoying urban life.
Here, '생활을' is used to describe a particular way of living or lifestyle—in this case, a healthy lifestyle.
건강한 생활을 유지하기 위해서는 운동이 중요해요.
Exercise is important to maintain a healthy lifestyle.
In this instance, '생활을' represents a phase or stage of life that has begun after a change, such as retirement.