![Heather Cozad of the U.S. warms up for "Tough Mudder" endurance event series in the Fursten Forest, a former British Army training ground near the north-western German city of Osnabrueck July 13, Heather Cozad of the U.S. warms up for "Tough Mudder" endurance event series in the Fursten Forest, a former British Army training ground near the north-western German city of Osnabrueck July 13,](https://c8.alamy.com/comp/2CXYTYE/heather-cozad-of-the-us-warms-up-for-tough-mudder-endurance-event-series-in-the-fursten-forest-a-former-british-army-training-ground-near-the-north-western-german-city-of-osnabrueck-july-13-2013-the-hardcore-but-un-timed-event-over-16-km-10-miles-was-designed-by-british-special-forces-to-test-mental-as-well-as-physical-strength-some-4000-competitors-had-to-overcome-obstacles-of-common-human-fears-such-as-fire-water-electricity-and-heights-reuterswolfgang-rattay-germany-tags-society-2CXYTYE.jpg)
Heather Cozad of the U.S. warms up for "Tough Mudder" endurance event series in the Fursten Forest, a former British Army training ground near the north-western German city of Osnabrueck July 13,
![Tough Mudder UK & Germany Back in Business | Mud Run, OCR, Obstacle Course Race & Ninja Warrior Guide Tough Mudder UK & Germany Back in Business | Mud Run, OCR, Obstacle Course Race & Ninja Warrior Guide](https://www.mudrunguide.com/wp-content/uploads/2020/01/TM-UK-dates.jpg)
Tough Mudder UK & Germany Back in Business | Mud Run, OCR, Obstacle Course Race & Ninja Warrior Guide
![Tough Mudder UK & Germany Back in Business | Mud Run, OCR, Obstacle Course Race & Ninja Warrior Guide Tough Mudder UK & Germany Back in Business | Mud Run, OCR, Obstacle Course Race & Ninja Warrior Guide](https://www.mudrunguide.com/wp-content/uploads/2020/01/TM-UK_GB.jpg)