My Little Man

Today we are outside working. TJ, 5, was pulling his 2 little sisters in the wagon.

Around the driveway,
down the sidewalk and back,
through the grass to the side yard and back,
down the driveway again.

It was obvious he was getting worn out. He stops, breathes deep. "I am getting tired...but....I am a man so..." and off he goes again.

Where did he learn that?