"
their eyes, because he's stronger than you know
A heart of steel starts to grow
[Chorus:]
When you've been fighting for
By fighting for this thing all your life, you would be struggling to make things right just like the lyrics say. By struggling to make things right is by fighting for that thing but you can't get it right away, but when they say "that's how a superhero learns to fly" is that superheroes go through tough times and are strong enough to go through that situation and struggle just like an average human. So everyone is a superhero because we all have gone through something tough once in our life trying to get through that situation and that's what makes us stronger.