V-기로 결심하다
Use -기로 attached to a verb stem to express a firm decision or resolution. It often appears with 결심하다 or 다짐하다 when someone makes a personal plan or goal. You can reuse this pattern for future actions, for example: 저는 내일부터 매일 아침 운동하기로 결심했습니다. This means "I decided to exercise every morning starting tomorrow."
저는 내일부터 매일 아침 운동하기로 결심했습니다.
I decided to exercise every morning starting tomorrow.
