BROOKLYN, N.Y. – Sept. 25, 2019 – Tough Mudder, the global fitness and active lifestyle brand, is returning to Northern California with its 2019 Tough Mudder NorCal on October 5-6. This year’s event will offer exciting new activations, including Tough Mudder 5K, which was unveiled in early 2019 and opens the event to participants of all ability levels.