and then there's Fearless Leader, ken: click to embiggen!
there's a lot going on, to put it mildly. so much so, that just gray-to-orange wouldn't do - but rainbow would. red is mid-2004, up to the purpley present. so much chaos that this just might need to get animated.
the most noticeable thing is the clear separation between training in the upper left, and racing in the lower right. it's a bit tough to see through the layers, but it looks like ken had a super fast orange period, a dip in the green years and stready improvement through blue into purple. and that's just training time - superfast race performances come in all colors.
also crazy: over 10700km of running! in 57000 minutes - that's damn near 40 days! the mind boggles! go ken!
also cool, zooming out a bit shows some catatonically-low hr, recently-run training runs: