'Superkid,' 3, Moves Furniture, Weights. His body has very little fat and enlarged muscle fibers that make him really strong...

He can move furniture, hold five-pound weights, and do sit-ups with ease.

But Liam Hoekstra, of Roosevelt Park, appears to have a rare genetic condition -- one that presents special challenges to him and his parents, Early Show Medical Correspondent Dr. Jennifer Ashton said Thursday.

Ironically, learning more about it could lead to treatments for other muscle afflictions, researchers say.

Source: www.cbsnews.com