Why did the cardiologist in this bbc vid on heart conditions in the young

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clear a young woman with a heart condition that could cause sudden death to run a 10k?
https://www.youtube.com/watch?v=VC1F8V-5PBk
Why are doctors always puhing running (which destroys your joints) instead of weight lifting, especially to women, who are very prone to muscle and bone loss with age?