is a pretty straightforward obstacle. I imagine that at some events, you will actually need to swim to complete it, however, at Tough Mudder Toronto, the small lake that was used for this obstacle was shallow enough that swimming wasn't necessary.
Bob underneath rows of floating barrels as you battle the frigid water temperatures. This obstacle requires mental grit, as extreme cold can be as challenging mentally as it is physically. Focus on breathing, and move quickly through the water to complete the Underwater Tunnels and warm up once you are ashore. You can prepare for this obstacle by swimming in ice-cold bodies of water, or taking cold showers. Try to regulate your breathing and control your heart rate in order to acclimate your body to cold water conditions.
In order to train for this event, I would be prepared to swim. Most Tough Mudder events, to my understanding, do not have enough swimming involved in their obstacles to warrant serious training, but being able to swim should at least be an initial trait you possess.
Other than that, there is not a whole lot extra you can do to train or prepare for this event.
Quote of the day:
“A successful man is one who can lay a firm foundation with the bricks that others throw at him.”
- Sidney Greenberg