Muscle & Fitness‘ chief content officer, Zack Zeigler, completed one of the ultimate tests of endurance — the Spartan Trifecta. After completing the Spartan Super (12-14 miles) and Sprint (5 miles) in one day, Zack tackled the Beast (a 14-16 mile race with obstacles) to close out a taxing weekend. 

Here’s some behind the scenes action from the Beast. 

Day 1 at the Spartan Trifecta World Championships

Day 1 at the Spartan Trifecta World Championships

Day 1: 'M&F's' chief content officer, Zack Zeigler, puts his grit to the ultimate test in Sparta, Gr...

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