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The marathon is the ultimate test of endurance for running athletes. The origin story has withstood the ultimate test - the test of time. And, steeped in historical legend, it has endured as well. Understandably so - it's a good one.

Picking up running after her collegiate tennis career ended has not only kept Angela Beeler healthy, she gets to go on 26.2 mile tours of some of the most iconic and scenic sights in the world.

The Warrior Games, set to commence on May 11, 2013, is a paralympic style competition among the different U.S. Military branches and for the first time this year, the British Military as well. ATLX spoke with competitor Lt. Colonel Danny Dudek about his experience with last year's games, and his training and goals for this year's competition.

ATLX Expert Dr. Rob Ziltzer says going from coach potato to marathoner in 6 months is not only doable, but maybe easier than it seems. He's done it. 9 times, actually. Find his tips and motivational tools, right here for the taking.

It all started because Joe Hayes was feeling a little pudgy. Now with over 100 ultra-marathons under his belt, he discusses the balance, lifestyle and mindset necessary to run ultra-marathons for over 40 years.

Paul Theodore recently attempted to break the world record for most pull-ups in 24 hours. Find out what fueled this man's fire to take on the lofty challenge.

ATLX Expert Brett Stewart gets called in to test Obstacle Courses and Mud Runs in his spare time. Why? Because he knows what makes up an awesome challenge. Alpha Warrior, one of the most technically challenging courses out there, asked him to give it a go. Here's Brett's Breakdown.

Steve Moyer, trainer and nutritionist to well-known celebrities and everyday athletes, walks us through his successful fitness regimen.

Whether they're bulking up to be part of The A-Team or practically starving themselves for a psychological thriller, these Hollywood men know how to mold their bodies to fit any role.