Starting or Ending?

From James Clear’s 3-2-1 Nesletter

In some areas of life, value is unlocked by starting. Even a five-minute workout or a short walk can reset your mood and benefit your body.

In other areas, value is unlocked by finishing. It does you no good to build a bridge halfway across the river. You need to complete the project to realize the value.

Do you need to start or finish? Are you building a body or building a bridge?"