In terms of the anatomy, if you look at someone with a rounded upper back and caved chest, they usually have an excessively flat lower back with too much posterior pelvic tilt.
And this seems to be a very common swimming physique.
Nothing will sink your hips and prevent them rising up like breathing late will.
Sort of strange it took this long before someone mentioned breathing! I agree, and would also add that how one breathes, in addition to when, is very important. Most people lift their head straight up and way too high out of the water. Ideally you should lift the head just enough so the chin clears the water and think about thrusting the chin forward rather than lifting the head. Michael Phelps does this so well he's able to breathe every stroke without dropping his hips.
In terms of the anatomy, if you look at someone with a rounded upper back and caved chest, they usually have an excessively flat lower back with too much posterior pelvic tilt.
And this seems to be a very common swimming physique.
Nothing will sink your hips and prevent them rising up like breathing late will.
Sort of strange it took this long before someone mentioned breathing! I agree, and would also add that how one breathes, in addition to when, is very important. Most people lift their head straight up and way too high out of the water. Ideally you should lift the head just enough so the chin clears the water and think about thrusting the chin forward rather than lifting the head. Michael Phelps does this so well he's able to breathe every stroke without dropping his hips.