Running: Three, Faster

My left ankle has been hurting for the last three days. It feels like there are tiny rocks in the joint and they're forcing me to roll my ankle out a bit as I walk in order to avoid the pain. So, like any completely rational person would do, rather than running four miles this morning I ran three...faster. I know, I know....it doesn't make sense. Ankle was bothering me while stretching and through warm-up but as soon as I began running the pain went away....so I powered through the run. Good cardio. I can totally feel it in my lungs. Ahhhhh.....