Exercise and psychological well-being: definition, regular exercise is associated with reductions in anxiety and depression. Acute and chronic effects of exercise: definition, acute- short term effects. Aerobic exercise is associated with lower state anxiety and higher tranquility scores. Postexercise reductions in state anxiety return to preexercise anxiety levels within 24 hours. Moderate-intensity exercise produced the greatest positive effects in affective responses. All durations of exercise significantly reduce anxiety, although larger effects have been found for periods of up to 30 minutes. State anxiety returns to preexercise anxiety levels within 24 hours (and maybe as quickly as 4 hours) Exercise is associated with reductions in muscle tension. The anxiety reduction after exercise occurs regardless of intensity, duration, or type. Anxiety reduction after exercise occurs in all types of participants: chronic- long term effects. Physical fitness is positively associated with mental health and well-being. Exercise is associated with the reduction of stress emotions such as state anxiety.