Even those who aren't baseball aficionados should find something interesting and human in this straightforward, brainy documentary Fastball looks at the titular type of pitch not just from a place of scientific curiosity but as a symbolic goal that players all over the world chase after. Through many clear-eyed discussions and testimonials, we begin to see how a large part of the sport has been structured around the idea of understanding speed—and how some careers have been made or broken by trying to catch up with the greats. But in the end, Fastball takes a surprisingly subjective position on the matter; instead of definitively stating who's the fastest on earth, it affirms that everyone has their own legends they look up to, pushing them to be greater.