I am unsure how to use these features...
In September I ran my first ever marathon, and my fitness showed 100+ points (I don't know what these are) but I had the darndest time executing my plan on a mostly flat course.
Fast forward 6 months and My fitness was about 50 however finishing the LA Marathon I was able to execute well, and my legs felt great going into mile 18 (no wall) I PR'ed by 10 minutes, yes I'm still slow but I beat my previous time by 10 minutes and I didn't hit a wall despite all the hills.
So I don't know how to use these numbers on the graph by Strava because it would be my assumption that the higher the fitness I should be able to run farther / faster than when fitness is lower?