When you think about it, a twig-shaped dumbbell is rather ironic, right? The word twig is often used to describe skinny or scrawny arms or legs, and dumbbells, well, they help bulk up arms. The Twig dumbbells are an innovative dumbbell design by Ji Hoon Lee. With a handle and three prongs on each side, the weight of these dumbbells can be changed simply by switching the prongs.