(from the article, "Walking makes us healthier, happier and brainer") There is substantial data showing that walkers have lower rates of
Depression
O Extraversion
Walking
Openness

Depression.

Explanation:

In The Guardian article "It's a Superpower: How Walking Makes Us Healthier, Happier and Brainier", author Amy Fleming discusses how walking is good for one's health. On a discussion with neuroscientist Shane O’Mara, Amy delves into the benefits of walking.

In stanza 5, the author mentioned a study from 2018 that O'Mara cited about how active people are more inclined to have "the positive traits: openness, extraversion, and agreeableness." He continues: "There is substantial data showing that walkers have lower rates of depression, too".

Thus, the correct answer is depression.