If it helps, the USAFA may request that you take it again. They did for me. But I think that only happens if the rest of your application is competitive and that's the only area significantly under average(but let's keep in mind that even after re-taking it, I was still TWE'd before getting my FF stuff). I got mine up to passing scores because my first time was TERRIBLE. Here's a glance.
1st CFA(December 2010)
BBall Throw: 52
FAH: 9 seconds
Pushups: 16
Situps: 79
Shuttle Run: 11.4
Mile Run: 7:28
2nd CFA(late January 2011)
BBall Throw: 61
FAH: 13
Pushups: 29
Situps: 89
Shuttle Run: 10.9
Mile Run: 7:38
Even though my mile was a tad slower, it was an improvement. Now, after being at prep school... But if they feel there's a reason you should retake it, they'll let you know. But for now, train, train, train!