But will human performance peak soon? Australian athlete Gout Gout is potentially the fastest sprinter of all time. The question is how fast he might actually be able to go.
The teenager who could outrun Bolt
Record breaker: Australian sprinter Gout Gout has smashed age-group records, sparking debates over the psychological and technological limits of human speed and whether he could finally surpass Usain Bolt’s legendary legacy. Glossary
Mount Everest - The world's tallest mountain, which straddles the borders of Nepal and China. Temperatures can drop to -60C. The first known people to climb the mountain were New Zealand's Edmund Hillary and the Sherpa, Tenzing Norgay.
Altitude - The height of an object or point in relation to sea level or ground level.
Polyurethane - A versatile plastic material used to make many everyday items, such as the foam in cushions, the soles of shoes, and protective coatings for wood.
Physiological - Relating to the way in which the body functions.
Psychological - Relating to the mental state of a person.