Introduction:
When it comes to exercise for children, it is important to choose activities that are appropriate for their age and developmental stage. Regular physical activity is crucial for the overall health and well-being of children. Among the given options, cycling is the most appropriate exercise for an 11-year-old child.

Benefits of Cycling for an 11-year-old child:
1. Cardiovascular Fitness: Cycling is a great aerobic exercise that helps improve cardiovascular fitness. It increases heart rate, strengthens the heart, and improves lung capacity.

2. Muscle Development: Cycling involves the movement of the legs, which helps in the development of leg muscles. It also engages the core muscles and improves overall body strength.

3. Bone Health: Cycling is a weight-bearing exercise, which helps in building stronger bones and reducing the risk of osteoporosis later in life.

4. Balance and Coordination: Riding a bicycle requires balance and coordination, which helps in improving these skills in children. It also enhances their motor skills and body awareness.

5. Mental Well-being: Cycling is a fun and enjoyable activity that can help reduce stress and improve mood. It provides an opportunity for children to spend time outdoors and explore their surroundings.

6. Independence and Confidence: Cycling allows children to gain a sense of independence as they can explore their neighborhood or ride to school. It also boosts their self-confidence as they learn new skills and overcome challenges.

Conclusion:
Among the given options, cycling is the most appropriate exercise for an 11-year-old child. It offers numerous benefits, including cardiovascular fitness, muscle development, bone health, balance and coordination, mental well-being, and independence. Encouraging children to engage in regular physical activity like cycling sets a foundation for a healthy lifestyle and promotes their overall well-being.