Eye of the Tiger is a better song, but Hearts on Fire still comes with the best Rocky training montage ever.  The only other Rocky montage that comes close is the one in Rocky III, mostly because Rocky and Apollo Creed have this really gay scene at the end of the montage where they jump around in the ocean and hug each other not once, but twice, in slow motion.

I watch a lot of cheezy movies. So sue me.

I agree. =) Here's the original.