What does it take to run a marathon on all seven continents and the North Pole? For Dr. William Thomas, it was about much more than athleticism; it was a masterclass in overcoming the mental barriers that hold us all back. In this episode of The Author’s Voice with KAJ, we dive into the lessons from his book, Cross the Lines. Dr. Thomas started running at 42 and transformed his life, proving that the biggest obstacles aren't physical—they're the limits we place on ourselves.