The 15-5 Workout

21-Minute Lunchtime Workout

The hotel dumbbell workout

YLW Phase V Workout B

TRANSITION: Back and Biceps Workout

Bodybuilding: Chest and Back Workout

TRANSITION: Chest, Shoulders, and Triceps Workout

BULK UP: Leg Workout (Part 1)

Bodyweight workout: Six-pack plank variations

Cure a Hangover: The Friday DETOX Workout

Weekend One-Up: Weight-Plate Workout

Bodyweight workout: 4-minute strength sets

The Battle Ready Workout Plan: Day 1

BULK UP: Chest, Shoulders, and Triceps Workout (Part 1)

Beginner's Back and Biceps Workout for Building Muscle

BULK UP: Back and Biceps Workout (Part 1)

Total-Body Conditioning Workout with the Fitbit Charge

BUILT for the BEACH: Two Full-Body Workouts to Lose Weight

22-Minute Workout

YLW Phase VIII Workout B

YLW Phase VIII Workout C

Challenge Accepted: Spartan Ultra Iceland, Part 2

Challenge Accepted: Spartan Ultra Iceland, Part 1

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