Archives par mot-clé : freediving

Quick Descritpion of the Breaststroke/No Fin (DNF & CNF) kick

The breaststroke kick exist on two form, the « first » breaststroke kick and the « sports » breaststroke kick.
The first breaststroke kick is the one teached in a first learning of the breaststroke, it’s not a very efficient kick but it is an easier one in terms of motricity, specially for kids.
The sports breaststroke kick is the one used by competitive swimmer.

We are only gonna develop the second one during this description:

  • In a first place the swimmer will bring his hills on the side of his buttocks (this gonna allowed a minimum of frontal drag)(pic. 1 to 4 on Illustration 1).
  • He also have to focus on keep his knees together (this gonna allowed a minimum of lateral drag).
  • During this phase the swimmer will have to flex is ankle in the same time than he brings them back to his buttocks (pic. 4 and 5 on Illustration 1).
  • Then he is gonna whip his lower leg and his ankle in order to close both of them (5 to 8 on Illustration 1).
Illustration 1 : Ed moses kick’s drill underwater.
Source : https://www.youtube.com/watch?v=4FKCYWGOC2M&t=52s

Now practice and enjoy !

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Upper body propulsion from Swimming to Freediving

Introduction

Propulsion is an important aspect of swimming.
The purpose is to be as efficient as possible, using muscles only when necessary and avoiding the waste of energy.
The majority of the propulsion studies in swimming promotes front crawl. If we look closely at the underwater arm movement and the motor path of the hand, we see that the underwater breastroke and the front crawl have very similar, if not identical, motions and pathways.
The article below expands on this topic.

Continuer la lecture →

The Streamline in Swimming apply in Freediving

Being streamline means having a position in the water that creates as less drag/resistance as possible.

Brent S. Rushall said :

« It is important to consider resistance in terms of swimming performance. If resistance can be minimized, then the propulsive effects of a swimmer’s efforts will be maximized. »[Rushall B. and all 1994] (Part IV – Resistive Force)

There is 3 differents kind of resistance that a swimmer as to face [M. Toussaint and Peter J. Beek, 1992]:

  • The pressure drag
  • The wave-making resistance
  • The frictional drag
Continuer la lecture →