Running distance over time. I still can't run 5k without walking about 20% of the way.
And it's not going fast either, but I'm still proud of the progress. The data is keeping me going.
EDIT: Thanks for the support! The legs still don't want to do, what I want them to. But they will learn, who's the boss eventually.
Strength training in the gym helps a lot with running pains and injuries