It's called a "Comfort Zone" because it's comfortable!

We are constantly growing and changing as human beings and in order to grow, we need challenges. Remember, in life, there is no standing still. You're either moving forward or backward. We're either growing or dying. It's like the story of the coral along the Great Barrier Reef in Australia. The coral on the ocean side, being challenged by the winds, waves and elements, thrives and grows while the coral living on the serene bay side, with nothing to challenge it, withers and quickly dies.