This is the 5247th most frequent Japanese word.
養
"養" means "to nurture," "to cultivate," or "to foster."
Yō (養) here means 'to cultivate' in the sense of nurturing or supporting relationships or qualities.
彼は深い友情を養います。
He cultivates deep friendship.
Yō (養) in this context implies 'to maintain' or 'promote' one's physical condition or health.
健康を養うためには運動が必要です。
Exercise is necessary to maintain good health.
Yō (養) here denotes 'to raise' or 'to care for' as in providing for and nurturing animals.