Breaststroke requires a unique set of tools in order to be fast.  The hips, ankles and lower lumbar need to be flexible in different ways than for freestyle, backstroke and butterfly.  The external and internal rotation of the hips, the pronation of the ankles and a flexible lower back are necessary.  Learn some of the static stretches and dynamic exercises we use to increase flexibility in these key areas.  Marc Clayton is not a breaststroker and currently has average to above average flexibility in those three areas.  Whether you are more or less flexible than Marc, you can modify each of these exercises to fit your ability level.