Marathon running has been booming for some time, triathlons have flourished recently and now people are flocking to gruelling assault courses.
http://www.bbc.co.uk/news/magazine-16548236#sa-ns_mchannel=rss&ns_source=PublicRSS20-sa
http://www.bbc.co.uk/news/magazine-16548236#sa-ns_mchannel=rss&ns_source=PublicRSS20-sa
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