How to Display Results from Exercise Blog

I have a site that i use to track my runs, piano practice, etc. I used the Custom Fields plugin to define the fields i needed, like duration, distance, etc.

I’d like to have a form on a page where i could pick a couple dates,and see, for example, how many cumulative miles I’ve gone between those days.

I suppose I could create an HTML form (or use something like Contact Form 7) and write some custom PHP to get the appropriate posts, add up the columns etc. That’s a significant undertaking. Can anybody suggested an “easy” way?

There are probably some exercise-specific plugins, but i don’t want to go that way.

thanks!