Health chickens and small horse-drawn carts are idioms, which come from traditional proverbs in China. Health-preserving broiler refers to the way of health-preserving. Broiler meat is fresh and tender, rich in protein, and suitable for people who are old and weak and have not recovered from a long illness. Broilers also help to enhance the body's resistance, promote blood circulation and prevent diseases. A small horse-drawn car is a metaphor for a person who is incompetent for a task or job. This idiom originally refers to a small horse pulling a cart, which means that people with insufficient strength often fail to do things beyond their ability.