Daily hassles like commuting or arguments with family members can cause psychological stress and health problems. While positive events like exercise or enjoying music can help reduce stress, one study found they did not statistically reduce the impact of daily hassles. Personality factors also influence how people cope with stress. Those with a "hardy" personality see stressors as challenges rather than threats, and believe they have control over their lives. Studies found that training people in hardiness techniques helped them manage stress.