When you learn how to swim freestyle, it is important to move
the arms and hands correctly to swim efficiently and avoid
strain on the shoulders.
Basically, the arms move alternately, one arm stroking back in
the water while the other recovers to the front above the water.
Swimming Video
Initial position
We imagine that the swimmer has just pushed off the wall. At
this moment, both arms are extended to the
front, palms one on top of the other and facing the bottom of the pool.
Underwater catch and pull
At a certain moment after the push-off, the swimmer will initiate the
stroking action of one arm:
The wrist flexes, the hand now faces the back of
the pool.
The other arm stays extended.
The stroking arm's hand starts a backward motion on a line
that follows the middle of the body.
Simultaneously, the elbow flexes and stays close to the
surface in a high elbow position. The forearm starts it's backward
motion along with the stroking hand.
When the elbow is flexed about 90 degrees, the shoulder,
upper arm,
forearm and hand move back as a unit until the hand is at the level of
the belly button.
At that time, the elbow extends again, the hand brushes
past the hips and exits the water.
Above water recovery and reentry
When the hand has quit the water, the shoulder and arm
rotates so
that the palm's hand is parallel to the surface again, the elbow flexes
again and the hand starts to recover to the front.
When the hand arrives past the head's level, it
enters the water again and extends to the front.
When the hand arrives at the level of the other arm's
elbow, the other arm starts it's catch and pull phase.
The recovering arm continues it's extension to the front
until it's completely extended.
How To Swim Freestyle - Some tips
In the freestyle stroke, the hand entry in the water should
be flat and not thumb
first. Entering the water thumb first can cause swimmer's shoulder.
Avoid crossing the midline of the body when the recovering
hand extends to the front in the water. This puts the shoulder in an
awkward position which can also cause swimmer's shoulder.
Make sure to stroke back until your arm is extended and
brushes past the hip. This ensures a long and efficient stroke.