Breaststroke is unlike the other strokes in several
ways.
The first is that it has natural dead spots which means that it lacks
continuous propulsion. The minimization of the dead spots in breaststroke (i.e. getting
the timing right) and ensuring the body is in a streamlined position during
them are both crucial.
At its best the motion derived from the pull is neatly followed by that
generated from the kick which is then followed by a short streamlined glide
with the arms out in front of the body before the cycle starts again.
At it’s worst the arms pull back at the same time as
the knees move far too far forwards. Both actions thus cancel each other
out rendering the swimmer virtually stationery. For this reason breaststroke can be considered
the easiest and hardest stroke to master at the same time!