When Spelled, I Am A Question. When Shouted, I Am A Command

Riddle: When spelled, I am a question. When shouted, I am a command. I am great for your heart, but hard on the sand. What am I?

Answer: RUN.

Source: https://www.riddles.com/8088

When spelled, I am a question. When shouted, I am a command. I am great for your heart, but hard on the sand. What am I? — When spelled, I am a question. When shouted, I am a command by Trey Maurer v1.

Riddle: When spelled, I am a question. When shouted, I am a command. I am great for your heart, but hard on the sand. What am I? Answer: RUN. — by Trey Maurer v2.