EATONVILLE, Wash. — 30-year-old, 360-pound Lucas Hatton is a power-lifting machine. He can squat 700 pounds. He's split jerked 600. He pulls buses and trucks. Hatton has loaded up a 530-pound stone.

Whenever someone wants me to sign a bobblehead, they want me to do it on the butt,” says Cal Raleigh, the breakout Seattle ...