It's a graphic novel memoir by Alison Bechdel, who you might remember from Fun Home. It's about her attempt to keep mens sana in corpore sano (sound body, sound mind). She talks about her experiences exercising; and it's always in the context of her life; and she's human, so you get to find out about her fucking up (and occasionally getting things right) in between the fitness fads. It's not just about her; the comic also gets into some past writerly-artistic folks who went boldly striding around America when they needed to get their heads straight. This is a comic and thus has pictures; when it depicts folks boldly striding (or cross-country skiing or whatever) through nature, nature looks pretty good.