The 21-Day Shred Body-Weight Intervals

Challenge Accepted: Spartan Ultra Iceland, Part 1

Challenge Accepted: Spartan Ultra Iceland, Part 2

All the gear you need to crush a Spartan Ultra in Iceland

Challenge Accepted: Spartan Ultra Iceland, Part 3

Watch: Exclusive preview of 'The Redeemed and the Dominant: Fittest on Earth'

Simple, healthy Valentine's Day desserts couples can make together

Watch: Get a behind-the-scenes look at Tom Cullen's 'Knightfall' sword training

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

The best yoga moves to improve shoulder flexibility

Watch: Michael B. Jordan looks jacked during boxing training for ‘Creed 2’

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

Watch: 'Men's Fitness' editors team up with Katrín Davíðsdóttir and Brent Fikowski to test the Reebok CrossFit Nano 8

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

Watch: Brett Eldredge talks staying fit on the road, his love of hot sauce, and high-intensity training

This healthy and delicious grilling recipe is perfect for your end-of-summer BBQ

Eliud Kipchoge is a perfect marathoner. Here's how Breaking2 scientists made him faster.

Watch: This guy is running a 153-mile race. Here's the inspiring reason why.