My all time top choice is from Rocky III, because I believe the music plays a huge part and eye of the tiger is the GOAT montage song:
Number 2 would be Bloodsport Kumite montage (funny, I never noticed this song starts with the line "My body is ready" LOL:
Number 3 would be Karate Kid tourney montage, which oddly enough, was supposed to feature eye of the tiger, but the director chose "you're the best around" instead: