Map colors on Sports website

I recently purchased the Adventurer and took it out mountain biking yesterday. After syncing I noticed that one section of my route is yellow/gold. I have searched but can't find out what this means. Just interested to know why that section is different.
It was a long climbing section, so I am guessing perhaps something to do with performance? Heart rate, elevation, speed?
Also, are there any other map colours that may pop up?
Thanks!
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Thanks!