All but the 6 by 6 (inch) posts are temporary until the concrete is poured and cures.
The posts are held up without touching the bottom of the holes, so that some concrete will fill in under the posts.
The pull up bar will be added after the concrete cures. The bar you see here on the top posts is the pull up, but it's just there now for bracing, and will be repositioned for the final product.