Running/Weight Loss Log

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I've been using Nike+ for the last year or two. Before that, I was using MapMyRun, RunKeeper and some others.

Basically, everything I've seen offers the chance to track your distance, time and pace, but I want to track my weight with those runs. Does anyone know of any site or apps that can do that?

It would be nice to see the improvement or maybe look at myself today and say, "Well, today I'm 185 and running a 5K. On average, when I'm 185 and running a 5K, I tend to finish with at [this time]. Let's see if I can beat that today."