You don’t start with 1, you start with 0 – Sprint 0.
Where you iron out the bugs on how things are going to work.
Where you put the team together and see them in action for the first time.
Where you proof out the foundation and realize what you have and what you are missing.
Where you work with the team to get the requirements for the next iteration.
Where you figure out what does and doesn’t matter.
Where the seeds for delivery and what everyone will do when certain situations is planned out.
Sprint 0 is not about showing what you did in that 2 – 3 week sprint, it’s showing what you are going to deliver as a product.