Final answer:
Exercise can help Hari feel happier due to the release of endorphins which improve mood. Other activities like listening to music, eating ice cream, or watching a movie can provide temporary relief. For severe or persistent depression, professional help is advisable.
Step-by-step explanation:
When someone like Hari is feeling depressed, one thing he can do to feel happier is to engage in activities that might boost his mood. Among the options provided, exercise is one with scientifically backed benefits for improving mental health. Exercise releases endorphins, which are chemicals in the brain that act as natural painkillers and mood elevators. It's also proven to reduce stress, anxiety, and symptoms of depression, while boosting self-esteem and cognitive function.
Listening to music, eating ice cream, and watching a movie can also serve as temporary mood lifters, offering comfort, distraction, and enjoyment. However, it's worth noting that while they can provide short-term pleasure, they might not address the underlying issues of depression. If Hari's depression is severe or persistent, seeking professional help from a healthcare provider is highly recommended.