I remember one of my clients who took up boxing in the gym after taking brain drugs for a time. She reported that her exercise made her feel far better than all the psych drugs she took combined!
In dozens of clinical studies, exercise is proven to have superior supportive psychotherapeutic benefits. A repellant against depression and negativity, such as fear, worry, anger and tension.
Practiced regularly, exercise (aerobic or nonaerobic) helps bring better self esteem, enhanced mental and emotional performance, and resilience against stress.
Exercise "natural anti-depressant" may include: power walking, jogging, running, swimming, basketball, football, boxing, dancing, even gardening and housework.