Age

18–55

Sex

ALL

Healthy volunteers

Not accepted

Patients with schizophrenia, aged 18 to 55 years
Having persistent negative symptoms (SNS), negative symptoms self-assessment scale \> 7
Regularly monitored in the psychiatry department.
Have no medical contraindications to physical activity
Subject affiliated with or entitled to a social security system.
Subject having received informed information about the study and having co-signed, with the investigator, consent to participate in the study.
Male or female.

Patient unsuitable for study in the opinion of the investigator
Any subject with chronic joint pathologies (example: repeated sprains, patellar or ligament problems) or cardiac pathologies.
Any subject presenting chronic or central neurological pathologies.
Any subject deprived of liberty or subject to legal protection
Excessive consumption of alcohol (\> 14 glasses per week) or caffeinated drinks (\> 400 mg of coffee per day).
Pregnant women.
Subject unable to understand the purpose and conditions of the study, unable to give consent.

Synergy Between Physical Activity and Outdoor Green Environments to Reduce the Intensity of Negative Symptoms in Schizophrenia.