A beach, an airport, a rest stop, a graveyard, an outlet mall bathroom: These are a few of the places where the dancer Marlee Grace has filmed herself improvising during the past two years. Ms. Grace, 29, is the artist behind the Instagram account Personal Practice, a trove of short videos documenting her daily movement practice, and the author of a new self-published book about the project, “A Sacred Shift.” A scroll through the hundreds of posts reveals videos of her jamming out next to a post office; weathering the snow and rain; and, perhaps most often, dancing in her living room.

While Instagram has become a go-to forum for dancers recording themselves in class and rehearsal, Ms. Grace has managed to stand out, though it’s hard to pinpoint why. Maybe it’s her musical selections, which range from Justin Bieber to wind and waves; her playful, impulsive choices as a mover and iPhone videographer; or the sense that she’s not working toward anything in particular, just dancing for herself and anyone who happens to cross her virtual path.