Zippy Ziegler

Check out this.

Especially the paragraph:

After taking the swim out fast with a 25.53 and remaining under 28 seconds per 50 through 150 yards, Ziegler then settled into a 28-second range throughout the entire swim, including a sub-28 27.89 at the 1550, before sprinting home in 25.45. Her final 50 was actually quicker than her first 50.

Now that's good tactics and good conditioning (even if it is short-course yards!).