2. To evaluate the hypothesis that yoga will improve self-and parent-reported psychosocial well-being including affect, mood, stress and anxiety in high school students, relative to control students taking regular physical education. To test Specific Aim 2, both primary outcomes (affect and mood) will be assessed at both schools. Additional psychosocial well-being outcomes assessed at Monument Mountain Regional High School include: life purpose/satisfaction and self-confidence during stress; self-esteem; parent-reported psychological difficulties; perceived stress; and sleep quality. Additional psychosocial well-being outcomes assessed at Waltham High School include: self-esteem; parent-reported psychological difficulties; and sleep quality.