To keep fit and stay healthy, you should follow some simple habits to avoid unhealthy habits. First, eat healthy food and fresh vegetables to get essential vitamins for your body. Second, drink plenty of water every day to stay hydrated. Third, you should do exercise, do yoga or play sports daily to strengthen your body. Besides, avoid reading in dim light to protect your eyes. Finally, get enough sleep, about 8 hours a night, to refresh your mind.