So I'm focused, they try to throw me off track
But they just hurdles, I'm marathoning

from Big Sean (Ft. John Legend) – Memories (Part II) Lyrics on Rap Genius

Meaning

When you hurdle you jump over raised platforms while running which is really tough. All of Big Sean’s haters are trying to throw him off track, which is where you jump/run hurdles. He is saying that “they” are just little jumps and he’s in it for the long run — a marathon, which is equivalent to 26.2 miles, but isn’t actually the longest footrace out there.

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