Noah Lyles joined Usain Bolt in winning four successive world 200 metres titles on Friday, adding to one of the greatest medal collections of any sprinter in history.

His victory in one of the closest Olympic 100m finals in history in Paris last year will also live long in the memory.

Behind Lyles' success, though, lies a series of health problems, especially asthma, that have dogged him throughout his life.

The 28-year-old American also suffers from dyslexia and ADHD, and at times depression, which hit the gregarious personality hard during the Covid pandemic.

He has admitted it seriously affected his performance at the Tokyo Olympics, where spectators were absent and the restrictions numerous.

As a child there were many worrying moments due to his asthma, which kicked in when he was

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