A hollow golf club head having an inner surface and an outer surface , the golf club head comprising: a strike face operative to impact a golf ball; and a body extending rearward from a perimeter of the strike face , wherein the strike face locally displaces relative to a portion of the body in response to an impact between the strike face and the golf ball; wherein, the golf club head comprises a flexure joint extending from the outer surface to the inner surface , the flexure joint including: a forward impact surface ; a reaction surface in contact with the forward impact surface ; and wherein, in response to the impact, the forward impact surface translates along the reaction surface and elastically displaces the reaction surface to permit an increased impact-induced displacement of the strike face ; wherein the strike face defines a ball striking surface and a rear surface that is opposite the ball striking surface ; characterised in that the body includes a reaction wall that is in contact with the rear surface of the strike face ; and wherein the rear surface of the strike face is the forward impact surface of the flexure joint , and wherein the reaction wall forms the reaction surface of the flexure joint; and wherein the reaction wall is in contact with from about 30% to about 60% of the area of the rear surface . a strike face operative to impact a golf ball; and a body extending rearward from a perimeter of the strike face , wherein the strike face locally displaces relative to a portion of the body in response to an impact between the strike face and the golf ball; wherein, the golf club head comprises a flexure joint extending from the outer surface to the inner surface , the flexure joint including: a forward impact surface ; a reaction surface in contact with the forward impact surface ; and wherein, in response to the impact, the forward impact surface translates along the reaction surface and elastically displaces the reaction surface to permit an increased impact-induced displacement of the strike face ; wherein the strike face defines a ball striking surface and a rear surface that is opposite the ball striking surface ; characterised in that the body includes a reaction wall that is in contact with the rear surface of the strike face ; and wherein the rear surface of the strike face is the forward impact surface of the flexure joint , and wherein the reaction wall forms the reaction surface of the flexure joint; and wherein the reaction wall is in contact with from about 30% to about 60% of the area of the rear surface . a forward impact surface ; a reaction surface in contact with the forward impact surface ; and wherein, in response to the impact, the forward impact surface translates along the reaction surface and elastically displaces the reaction surface to permit an increased impact-induced displacement of the strike face ; wherein the strike face defines a ball striking surface and a rear surface that is opposite the ball striking surface ; characterised in that the body includes a reaction wall that is in contact with the rear surface of the strike face ; and wherein the rear surface of the strike face is the forward impact surface of the flexure joint , and wherein the reaction wall forms the reaction surface of the flexure joint; and wherein the reaction wall is in contact with from about 30% to about 60% of the area of the rear surface . <EOS>