Stress is highly problematic condition in schizophrenia survivors. Both stress and schizophrenia are interrelated because not only stress causes relapse of disease but the schizophrenia relapse may also contribute to increased anxiety and stressful behavior in patients. Common warning signs of schizophrenia relapse are insomnia, difficulty in concentrating, irritability, paranoia etc. It is important that caretakers remain vigilant and if patient shows increased vulnerability to stressful situations and become irritating, he shall be directed immediately to the physician. Hence, stress may serve as a risk factor in contributing to insomnia and anxiety.
Repetition is repeating a certain exercise. Sets within a workout is how many repeations you do at one time. For example you can do 5 squats, 3 times. The 5 squats are the repeations and the 3 times are the sets. It is important to do reps and sets to build up endurance and gain muscle over time. I hope this helps!