Complex sentence: Alexander believed the individual's self awareness could be inaccurate, resulting in unnecessary muscular tension such as when standing or sitting with body weight unevenly distributed, holding one's head incorrectly, walking or running inefficiently, and responding to stressful stimuli in an exaggerated way.
Split into simpler sentences: Alexander believed the individual's self awareness could be inaccurate, resulting in unnecessary muscular tension. Examples include standing or sitting with body weight unevenly distributed, holding one's head incorrectly, walking or running inefficiently, or responding to stressful stimuli in an exaggerated way.