The screenplay for 'How to Train Your Dragon' always resonated because it treats coexistence as something you have to earn, not just wish for. Hiccup and Toothless start as potential threats to each other, and that initial sequence where he's learning to build the prosthetic tail—that's the theme made literal. They're literally building a bridge, piece by piece, between two worlds that are supposed to be enemies. It's less about a grand war and more about the quiet, daily work of understanding.
What strikes me on re-reads is the generational trauma angle, actually. Stoick's entire worldview is built on loss and a perceived need for constant defense. The script shows Hiccup dismantling that not through rebellion for its own sake, but by presenting a better, tangible alternative. The moment when Stoick sees Hiccup flying—it's not just cool, it's the visual proof that unravels a lifetime of fear. The core argument is that real strength isn't in destroying the thing you fear, but in making it your ally.
I think the script also cleverly uses Hiccup's physicality. His clumsiness and lack of traditional Viking strength aren't just comic relief; they're what force him to use his brain and heart instead of his axe. That's the real 'training' in the title.