What is the body of 1 Corinthians 11:29?

In 1 Corinthians 11:29, what is Paul making reference to when he says “if he does not judge the body rightly”? Which body is he speaking of?

1 Corinthians 11:29 reads, “For he that eateth and drinketh unworthily, eateth and drinketh damnation to himself, not discerning the Lord