BBC News - From marathons to mud running

BBC News - From marathons to mud running: "Marathon running has been booming for some time, triathlons have flourished recently and now people are flocking to gruelling assault courses. But how did recreational sport get so extreme?"

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Boost spring marathon training: Run SMART Winter Retreat with Coach Jack Daniels - National Running | Examiner.com

Boost spring marathon training: Run SMART Winter Retreat with Coach Jack Daniels - National Running | Examiner.com: "
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