The point is to use the explosive power of your legs to optimally throw & catch a very heavy thing over your head. It’s not designed specifically to work any pa

The point is to use the explosive power of your legs to optimally throw & catch a very heavy thing over your head. It’s not designed specifically to work any particular muscle but test your overall capability. That said it’s much, much harder on core & shoulder stability in particular than either deadlifts or back squat. Or front squat for that matter.