Great tor toning your upper body, as well as helping develop the ideal swimming stroke.
The Sun
A video to improve my swimming stroke doesn't sound nearly so bad.
Houston Chronicle
Their shoulder girdles remained weak, their pelves could not support the power of a strong swimming stroke, and their flippers were blunt.
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No conventional swimming strokes are allowed - only doggie paddle.
Times, Sunday Times
Conventional swimming strokes, such as the breaststroke and crawl, are not allowed.
Times, Sunday Times