The whole body is involved in moving a shell through the water. Although rowing tends to look like an upper body sport, the strength of the rowing stroke comes from the legs.
The stroke is made up of four parts: Catch, Drive, Finish and Recovery. As the stroke begins, the rower is coiled forward on the sliding seat, with knees bent and arms outstretched. At the catch, the athlete drops the oarblade vertically into the water.
At the beginning of the drive, the body position doesn't change – all the work is done by the legs. As the upper body begins to uncoil, the arms begin their work, drawing the oarblades through the water. Continuing the drive, the rowers move their hands quickly into the body, which by this time is in a slight "layback" position, requiring strong abdominal muscles.
During the finish, the oar handle is moved down, drawing the oarblade out of the water. At the same time, the rower "feathers" the oar – turning the oar handle – so that the oarblade changes from a vertical position to a horizontal one. The oar remains out of the water as the rower begins recovery, moving the hands away from the body and past the knees. The body follows the hands and the sliding seat moves forward, until, knees bent, the rower is ready for the next catch.
INFORMATIONAL SOURCE: WWW.USROWING.ORG