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Palms down bending requires strong thumbs.
This form of bending relies upon wrist supination and thumb strength to bend a bar, with very limited involvement of the rest of the body. The bar is grasped with the palms facing down, forearms parallel to the ground. The elbow may be straight or bent. The ends of the bar are then rotated down, towards each other, with the thumbs acting a fulcrum for the bend.