midsection

noun
  1. The middle part of something, especially the central part of the human body, typically referring to the area between the chest and the waist. noun
    He focused on strengthening his midsection through various core exercises.
    The doctor examined the patient's midsection for any signs of injury.
  2. The central part of any object or structure, often referring to the middle portion of a text, document, or piece of music. noun
    The midsection of the novel contains the most intense action.
    The midsection of the song features a beautiful instrumental solo.