Liam Hoekstra has a very rare a condition known as myostatin-related muscle hypertrophy which increases muscle mass while lowering body fat. Because this rare genetic defect, also called myotonic hypertrophy, the 3 year old from Michigan could be a world class body builder, maybe even Mr. Universe, if he wasn't still a toddler. Liam first made headlines while still a toddler. Dubbed by some as the World's Strongest Boy young Liam Hoekstra looks like any other kid his age until you ask him to lift weights or do some sit ups. Before Liam was 2-years old he was already a curiosity, something his family worked hard to avoid.