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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
I know this comment was 8 months ago, but just so you know, this happened to me a few times and generally it has to do with the internet connection. Just refresh the page and it should work fine. Something gets stuck in the ajax.