Tough Mudder on Twitter: "The UK Tough Mudder Competitive Series 2018 has landed. #ToughMudder #TougherMudder #ToughestMudder #WorldsToughest https://t.co/H9SPPpuSFu… https://t.co/IUYWegO4z9"
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Tough Mudder 2014: It's back - and it's bigger than ever - Mirror Online
Tough Mudder targets Asia and Middle East with IMG partnership | Financial Times
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