Is self-belief all you need? Luke Littler reached the final of the World Darts Championship at the age of just 16. Experts say his belief in himself was key to his success.
The teenage sensation who preps with pizza

Glossary
Darts - A sport in which players throw sharp objects called darts at a round target, or dartboard.
GCSEs - National exams taken by 15 and 16-year-olds in England, Wales and Northern Ireland.
Routine - Something you do regularly and consistently — for example, you might go for a walk before breakfast every day.
Omelette - A dish made from eggs fried with butter or oil in a pan.
Confidence - Having little doubt and a feeling of trust.
Mental health - The part of your health that has to do with your mind, your thoughts and feelings.
Doubt - Not knowing what to think or believe.