The secret to making the biggest splash when dive-bombing water is to use the Manu technique practiced by the Maori people of New Zealand. This requires folding your body so that your torso and legs form a V-shape as you fall, so that your butt hits the water first.
The origins of manu, the Maori word for bird, are not clear, but the idea is to jump off bridges, piers, rocks, diving boards, and make the biggest splash possible…
Source: www.newscientist.com