This term has become synonymous with freestyle, because it is the fastest way. The swimmer is flat on the surface of the water on the belly. His arms come alternately from water to waist level and return to dive along the longitudinal axis of the body, after an aerial tour. Underwater, the arm works in 3 phases: a brief supporting the drive to the perpendicular in relation "to the surface and push until out of the water. 1 reciprocating movement of the lower limbs in a vertical plane, said the overall balance and propulsion aid.
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