Coach G. John Mullen over at Swim Science is the future of swim analysis and coaching. He is a doctoral candidate at USC in physical therapy, he coaches weekly and his race analysis and postulates have have lots of math that is both demonstrable and inspiring.
Here is a snippet analysis of Rebeca Soni versus Jessica Hardy:
"... Second 25 meters: Once again, Hardy has a great turn and starts off strong getting to the 15-meter mark .4 seconds faster than Soni, but into the wall she already starts to fade. The last 10-meters into the wall, Hardy's distance per stroke is even with Soni's (1.67 meters/stroke), but her strokes/second (Stroke Rate) begins to fall to .21 strokes/second slower than her first 25 to .89. During this time Soni is steadyI cornered John at Starbucks yesterday we talked about swimming and blogging. Afterward he pin-pointed muscle groups for me that I need to stretch to improve my streamline. Most or all the coaches I asked about it told m to focus on my shoulders when in reality it is my upper back and pectorals that are causing me the most dificulty in executing a more reasonable streamline.
sailing continuing her stroke rate around .93 and her distance per stroke at 1.67 meters/stroke.
My overall impression at the first 50 is even though Hardy is ahead by .45 seconds, her slowing speed into the wall is not a good sign for the upcoming 50. ..."