Answer:
A natural tattoo on babies
What gets broken without being hold?
What has no hands but might knock on your door, and if it does you better open up?
Four kings of whom I am one lord. Often on deck but never on board. Though I have a large heart, I am always seen at war. During which I always wear a suit, but never a suit of armor. Who or what am I?
What you become during a workout?
People take me on walks and I run and have fun. What am I?