We will examine if there is an acute effect of one high intensity session of physical exercise (4x4 intervals) on psychological variables state mood, state anxiety, well-being and psychological distress. This possible effect will be examined in three groups, one group being the main group that the other two groups will be compared up against. Group 1: Patients with schizophrenia and other psychotic illnesses. Group 2: people with non-psychotic diagnosis. Group 3: people without any psychological diagnosis.
