Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_68956 ( "Sport" text, "Competition name" text, "Competing entities" text, "Age groups" text, "Held every" text )

### Question ###
what is the sport when the age group is 21 or younger and the competition name is world youth netball championships?

### Accurate SQL ###

SELECT "Sport" FROM table_68956 WHERE "Age groups" = '21 or younger' AND "Competition name" = 'world youth netball championships'