During first period at Olivenhain Pioneer Elementary School in Encinitas, Calif., Kristen McCloskey leads about two dozen third-graders through some familiar yoga poses.
"All right, so let's do our opening sequence A," she says, instructing the kids. "Everyone take a big inhale, lift those arms up. Look up."
At the end of the half-hour class, 8-year-old Jacob Hagen says he feels energized and ready for the rest of the day. "Because you get to stretch out and it's good to be the first class because it wakes you up," he says.