You might think there isn’t much going on at Ski Martock during the green season, but Mud Hero is back yet again with its six-kilometre, filthy, dirty obstacle course through the woods. With over 18 barriers to surpass—ropes, slides, walls and mud pits—this race will result in the best kind of mess possible. Gather your dream team and your cheering squad, and save a little energy for the after party.—Allison Saunders