The Tough Mountain Challenge is a fun run which challenges participants to run up and down Sunday River as well as through a series of obstacles.

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NEWRY, Maine (NEWS CENTER)-- Mud runs are growing in popularity because they are a fun alternative to running roads. That was proven at Sunday River as 6500 turned out to run up and down the mountain as well as a through a series of obstacles. All got wet and muddy and seemed to have a lot of fun.

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