Physical education curriculum established by the school, including competitive sports, aerobic and anaerobic activities, balance and coordination skills. Yoga is not a component of the curriculum.

12 to 16 weeks of group yoga classes (approximately 32 classes per student), 30-45 minutes per class, 2-3 times per week, during physical education class. Yoga program includes physical postures and movement, breathing exercises, partner/group games, deep relaxation and meditative techniques.

12 to 16 weeks of group yoga classes (approximately 32 classes per student), 30-45 minutes per class, 2-3 times per week, during physical education class. Yoga program includes physical postures and movement, breathing exercises, partner/group games, deep relaxation and meditative techniques.

The Brunel University Mood Scale (BRUMS) will be used to measure change in self-reported mood. The BRUMS is designed specifically for assessing mood in adolescents. It contains 24 adjectives that are all rated on a four-point scale to give a total mood score and scores for six subscales: tension, depression, anger, vigor, fatigue, and confusion. In a validation sample of nearly 2,000 British adolescents (12 to 18 years of age), multi-sample confirmatory factor analysis showed high factor validity. Criterion and construct validity were also acceptable. Furthermore, BRUMS is sensitive to short-term changes. More recently, the BRUMS has been successfully used in a large sample of American adolescents. Negative affective states, such as mood, are clearly linked to substance use trajectories.

The Perceived Stress Scale (PSS) is the most widely used psychological instrument for measuring the degree to which events are appraised as stressful during the last month. Construct and convergent validity is adequate, since it is moderately correlated with other measures of stress and self-reported health status. The 10 items in this scale were designed to tap how unpredictable, uncontrollable, and overloaded respondents find their lives. The scale also includes a number of direct queries about current levels of experienced stress. It is psychometrically sound based on epidemiological sampling that evaluated reliability and validity. Furthermore, the PSS has been administered to mid-adolescents (8th and 9th graders) with good internal consistency. Psychological stress has been associated with substance use in studies of adolescents and college students.

The Urgency, Premeditation, Perseverance, and Sensation Seeking Plus (UPPS-P) Impulsive Behavior scale is a 59-item self-report scale developed by Whiteside and Lynam to measure the multi-dimensional nature of impulsivity. Items are scored based on a four-point Likert-type scale as follows: 1) agree strongly, 2) agree somewhat, 3) disagree somewhat, and 4) disagree strongly. Factor analysis of eight other established scales that address impulsivity (in whole or part) revealed four factors that became the subscales in the UPPS-P: (lack of) Premeditation (11 items), Negative Urgency (11 items), Positive Urgency (14 items), Sensation Seeking (12 items), and (lack of) Perseverance (10 items). Internal consistency for these subscales showed alpha coefficients that ranged from 0.82 to 0.91.

Soothability. The Soothability scale of the Kendall-Wilcox Self-Control Schedule assesses adolescents' capabilities to reduce emotional tension and control calmness when distressed. This 5-item scale includes items such as, "If I get annoyed about something, I can get over it pretty quick," and "I can easily calm down when I am excited or "wound up". Planfulness. This 7-item scale derived from the Kendall-Wilcox Self-Control Schedule assesses individuals' planfulness in everyday situations. Sample items include "I like to plan things way ahead of time." Distractibility. Adolescent tendency to be distracted from daily work is measured by a 6-item scale derived from the Kendall-Wilcox Self-Control Schedule. Sample items include "I like to switch from one thing to another."