integration of sport stats into blog?

I have a running blog and have a community of same. What I’d like to do is have some kind of script available to members where they can input things like:

-date
-number of miles run
-pace/speed run
-etc

Then, it would be cool if daily, weekly, monthly stats could be placed into the sidebar menu.

Any advice for how this could be done/if there is a script for this?

Thanks!