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2308, get a grip.
If you think running a marathon is too dangerous then don't do it.
Or do it.
Either way, race organisers cannot be liable if someone pushes themselves too far and sadly has an incident. There simply can't be a trained medic every 5 years all the way along the course. Neither should there be. The organisers can provide a degree of basic medical cover, but they can't cover every eventuality. You keep mentioning "taking responsibility", that would seem to start with everyone running within themselves and accepting that if they really push themself then their risk may be increased.
You need to be realistic, and if you don't like it can I suggest you ditch the running and maybe stick to the couch?
And FFS don't even think about any properly dangerous activities like parachuting or skiing, you would be appalled at the lack of medical staff hovering in the skies waiting just in case you have a health problem while you're up there.
senidM, in light of JT141's warning, does that double as a hazmat suit?
It's ok JT141, after falling over, twice now, both times ending up in A & E having my head stitched back together, I've joined Colins jogging team, Never race, always avoid hard surfaces and ALWAYS wear myhttps://www.amazon.co.uk/Rubies-Official-Minions-Inflatable-Costume/dp/B00TO6DUOO/ref=sr_1_32?s=kids&ie=UTF8&qid=1540371554&sr=1-32&keywords=inflatable+costume