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Challenge Accepted: Spartan Ultra Iceland, Part 2

Challenge Accepted: Spartan Ultra Iceland, Part 1

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Challenge Accepted: Spartan Ultra Iceland, Part 3

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Fitness star Anna Victoria's top tips for a successful body transformation

The best yoga moves to improve shoulder flexibility

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Exclusive video: Miles Teller and Josh Brolin talk intense firefighter bootcamp for ‘Only the Brave’

How to commit to athletic excellence, according to Nike trainer Joe Holder

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Watch: Red Bull Crashed Ice athletes train with CrossFit star Camille Leblanc-Bazinet

Paige Hathaway shares her top secrets for social media success

Gut-Check Workouts: 8 quick routines to fight weight gain

The upper-body push/lower-body pull workout

The upper-body inner-beast workout for big, strong, and shredded shoulders, pecs, and triceps

Theater of War: How actor Michael Kelly gained military muscle for 'The Long Road Home'

Watch: Boxing superstar Saul 'Canelo' Alvarez talks training, motivation against Gennady Golovkin

'Men's Fitness' Guy School: The 101 on wine