I'm running.

"He is running." is an usual expression,
But "I'm running." is an unusual expression.
This board has such a message.
Exactly I think so.
Why do I say "I'm running" while I'm running.

So I imaged such a situation. ;-)

On a school ground Mr. Rabbit was running.
On that time Mrs. Tortoise passed by, and watched him.
"Why is he running in such a place?" she thought.
Because Mr. Rabbit was not a student nor a teacher.

"Hey, Mr. Rabbit, What are you doing?" she exclaimed.
"Off course, I'm running." he exclaimed back with rough breath.
"But what on earth makes you run in such a place?"
"Oh, oh...",he answered. "The ground is here."

Is that situation correct?