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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.
Maybe, but you're given the formula there, so you shouldn't worry about the units in this case. They are kg and meters btw. I'd add it to make it clear but there are many pending translations and they should be approved before doing it.