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_76593 ( "Finish Position" text, "Lengths Behind" text, "Post Position" real, "Horse name" text, "Trainer" text, "Jockey" text, "Owner" text, "Post Time Odds" text )

### Question ###
What's the post position when the lengths behind is 0?

### Accurate SQL ###

SELECT AVG("Post Position") FROM table_76593 WHERE "Lengths Behind" = '0'