Why can I deliver training but not design it?

You stand before a room and speak well. The slides move, the jokes land, people nod. You mistake this for the whole craft. It is not. It is half of it, and the easier half. Design is a different motion entirely. It begins at the end — what must this person do differently when I finish — and works backward from there. You have been starting at the beginning, with what you know, and building forward. That is why it eludes you. You are not failing at the thing you think you are failing at. This is not a flaw in your character. It is a gap in your training, and training can be acquired. But not alone, staring at a blank outline. With others who are building the same muscle, where you can see your draft fail against a real learner before it fails in the room.