The frog kick pushes water backwards, and to a lesser degree upwards, rather than backwards with alternating up and down component, as with the flutter kick and dolphin kick also used by divers. [2][7], Dolphin kick is the technique where both legs are moved up and down together, and may be done with paired fins or a monofin, which has foot pockets for both feet attached to a single wide blade. This takes advantage of the momentum produced by the power stroke to gain some distance and rest before starting the next kick, as the recovery stroke will increase drag. The effectiveness of finning techniques is to partly dependent on the fins used, and partly on the skill and fitness of the diver. For most of the dive, I have enveloped the brown cloud of bottom sediment that the divers had stirred up. Frog kick allows the diver to flare the fins at any time during the stroke to slow down, and can be converted to a backward kick or helicopter turn from some points of the stroke, which can allow more precise maneuvering at close quarters. When performed correctly, the frog kick places less stress on a diver's legs, knees and ankles than other kicks. Sometimes also called sculling kick,[4] the helicopter turn is useful for turning around and adjusting position in the water without using the hands. [2] Diving equipment which is bulky usually increases drag, and reduction of drag can significantly reduce the effort of finning. His feet and fins are together and he is in the perfect, streamlined position to slide through the water. For a given value of drag, diver effort can be minimised by using the kick stroke and fin configuration that has the most efficient conversion of muscular work into thrust. The frog kick is a much more effective kick and is easy to learn with proper instruction. The frog kick is an efficient and effective kick. Nevertheless it is a powerful technique and capable of producing high thrust, but this high thrust has a high energy cost when applied by sub-optimal fins and to high-drag scuba diving equipment, so it is often only used for short bursts by scuba divers. Once a diver is in the starting position, the next step is to open his fins to the sides. [1] This can be done to some extent by streamlining diving equipment, and by swimming along the axis of least drag, which requires correct diver trim. The diver's ankles will rotate and his knees will extend slightly, bringing his fins ever-so-slightly down. The efficiency of this style is also improved by extending the arms in front of the swimmer and tucking the head down for reduced drag. Maximum transfer of power from the swimmer to the fin requires a close fit which prevents relative movement between foot and fin. The dolphin and flutter kicks can be efficiently performed without interruption, but the frog kick must allow a low drag glide period or energy will be wasted.[4].
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