Exos | Formerly Core Performance

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Join for free and you'll gain instant access to our tracking and reporting tools, expert coaching tips, and a free trial to our personalized training and nutrition programs.

Build Muscle

Online strength training programs. Workouts and a nutrition plan to build muscle.

Training Programs

Strength Training Programs

Build strength where it matters most and shatter your own records with our total-body training and nutrition programs.

The Performance Life

Get Lean and Strong At Any Age

Our author provides a first-person account of his body composition through the years. Use his tips to stay lean and strong.

Training

The Core Performance Training Philosophy

Just getting started with Core Performance? Learn the basics of our approach to performance training and how you can benefit from it.

The Performance Life

Mark Verstegen Discusses the Body’s Powerhouse Muscle in ESPN's Body Issue

Core Performance founder Mark Verstegen lets ESPN writer David Flemming in on a little secret: the glutes are the epicenter of all athletic movement.

Movement

Q&A: What are the Most Overrated Exercises?

Replace these old standards with new and improved exercises for a better workout.

Live Better

25 Ways to Make This Your Fittest Summer Ever

Shape up this summer with 25 surefire tips to boost your energy and improve your fitness.

Training

Strength Training 101

Build strength, size, and explosive power with a game-changing approach to resistance training.

Movement

Q&A: How Much Weight Should I Lift?

Answers to common questions about how much weight to lift in your workouts.

Editor's Picks: Build Muscle

New Content

Latest Tagged Build Muscle

Nutrition

Beta-Alanine May Reduce Muscle Fatigue, Says Study

A new study found that taking beta-alanine may help reduce acid buildup caused by intense exercise.

The Performance Life

Get Lean and Strong At Any Age

Our author provides a first-person account of his body composition through the years. Use his tips to stay lean and strong.

Training

The Core Performance Training Philosophy

Just getting started with Core Performance? Learn the basics of our approach to performance training and how you can benefit from it.

The Performance Life

Mark Verstegen Discusses the Body’s Powerhouse Muscle in ESPN's Body Issue

Core Performance founder Mark Verstegen lets ESPN writer David Flemming in on a little secret: the glutes are the epicenter of all athletic movement.

Movement

5 New Rules to Stay Fit for Life

Lou Schuler and Alwyn Cosgrove share their tips to improve your quality of life at any age.