This song was written for Rocky IV. Survivor also did Eye of the Tiger, which was the anthem for Rocky III so it only made sense to approach them to contribute a training song for Rocky IV. Burning Heart may not be as classic of a song as Eye of the Tiger but there’s no way Rocky could have defeated Ivan Drago without it. And if Rocky hadn’t defeated Drago, the Berlin Wall would never have fallen, America would never have won the Cold War, and Adonis Creed would have had to find a different mentor. Without this song, the world would be a very different place.
The video is a performance clip. There’s another version out there that features clips from Rocky IV.