Patent ID: 7988510

Claim:
A flipper for swimming or underwater activities or muscular training, comprising: a blade and a shoe, connected to the blade, in which the blade has a rear end facing the shoe and a front end opposite said shoe, and the shoe has a middle portion and a front part facing said rear end of the blade, said front part of the shoe and said rear end of the blade dynamically and kinematically separated from one another so as to avoid a transmission of forces and of relative movements in a direction substantially orthogonal to a plane of the blade; said blade having lateral extensions projecting beyond said rear end of said blade so as to extend laterally alongside the shoe and said extensions connected to said middle portion of the shoe, said extensions fixedly connected to said blade from said rear end to said front end; flexible tie rods elastically deformable under tensile forces and controlling angular variations between the blade and the shoe during swimming, said flexible tie rods connecting said blade to said front part of the shoe; and wherein a connection between said tie rods and said blade is adjustable so as to vary a pre-tensioning of said elastically deformable tie rods.