Answer:
They were probably obsessed with the timing of religious ritual, as the Mayans and Aztec would be after them. Even the ritual ball game so popular among the Aztecs is believed to have been played in the ancient Olmec civilization. And Some Major Achievements They Made in Their Lives. Such As,
#1 The Olmec were the first great Mesoamerican civilization.
#2 Olmec civilization produced some of the greatest Mesoamerican artworks.
#3 They created the most exceptional jade artworks by any Mesoamerican culture.
And
#4 They were the first Mesoamerican culture to build monumental sculptures. And Some Other Ones As Well.
Explanation:
And, I Know This Because, I've Read About Them Before.