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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.
he is using list indexing, ['Underweight', 'Normal', 'Overweight', 'Obese'][0-3].
if you want to know in detail i suggest asking gpt
This is actually best practice, as its 3 times faster than so called "BEST PRACTICE".