を保っている

is maintaining

→ を
phrase Rare #32,516
is maintaining Used to describe continuing to keep something in a particular condition, state, or relationship. The object before を is what is being maintained.
JA: 彼女は健康的な生活をして、体型を保っている。
EN: She maintains her figure by living a healthy lifestyle.

私は田舎の両親と連絡を保っている

I keep in touch with my parents in the countryside.

ベス美貌を保っている

Beth has maintained her beauty.

彼はジョギングをして若さを保っている

He keeps himself young by jogging.