Moods are perfect barometers of physiological and psychological functioning. Two biopsychological dimensions, Energetic and Tense Arousal, are keys to understanding moods. These dimensions interact under different activating conditions to form four complex moods that range from calm energy (pleasurable mood associated with full attentional focus, happiness, optimism, favorable athletic performance, and self-control) to tense tiredness (bad mood associated with depression, negative perception of problems, yielding to unwanted urges such as sugar snacking or smoking). Two other complex moods include tense energy (moderately positive state that combines vigor with moderate tension) and calm tiredness (ideal for restful sleep). Energetic and tense arousal are associated with many kinds of motivational processes, including various strategies of self-regulation (best strategy combines relaxation techniques, exercise, and cognitive control). Important to these moods are natural processes such as health, sleep, diet, diurnal energy cycles, movement (exercise), and stress. These moods are mediated by general bodily arousal states.