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What Is Metabolic Conditioning? Benefits, Types Of Workouts & Tips From Top Trainers

Author: Mallory Creveling, CPT

March 27, 2026

mbg Contributing Writer

By Mallory Creveling, CPT

mbg Contributing Writer

Mallory Creveling is a freelance writer and ACE-certified personal trainer, based in Brooklyn, NY.

Image by Marco Govel

March 27, 2026

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You might have seen metabolic conditioning noted on workout class descriptions or heard your favorite trainer talk about it on social media. Also known simply as metcon, the word gets tossed around a lot in the fitness world—and people use it to reference a whole range of workouts.

So, what even is metabolic conditioning, and should you add it to your workout schedule?

Here's everything you need to know about the training technique, including what it means, the benefits, and how to do it.

What is metabolic conditioning, really?

In short, metabolic conditioning involves work and rest intervals that train the body's energy systems more efficiently, says Liz Letchford, Ph.D., kinesiology specialist, certified athletic trainer, and coach for Tonal. So yeah, the definition is pretty broad. "The body uses several different strategies to provide energy to the working muscles," she explains. "These strategies are referred to as energy metabolism."

Because metabolic conditioning widely refers to work-to-rest ratios that can help your body perform better, it's become a sort of catchall term for higher-intensity workouts. In fact, metcon training includes everything from circuit-style strength training to high-intensity interval training (or HIIT) to endurance exercises like rowing, running, or biking for a period of time, with minimal rest, explains Noam Tamir, CSCS, founder and owner of TS Fitness in New York City. EMOM, which stands for "every minute on the minute" in which you try to hit a certain number of reps of a certain exercise in that minute, as well as AMRAP, or performing exercises for as many rounds as possible, both fall under the metcon umbrella.

Determining what you'll do during a metabolic conditioning workout, and how much work and rest time you'll have, comes down to your goals and which energy system you want to hone. "You want to structure the workout to get the most out of your body," says Kyle Prescott, M.S., CSCS.

Types of energy systems

There are three energy systems of the body, all of which work to produce adenosine triphosphate (ATP) to supply the body with energy, but they do so at different rates and with different fuel sources. Prescott breaks down how they all work:

- The phosphagensystem is involved in high-intensity work for a short burst of time, up to 10 seconds. This system kicks in immediately when you start moving fast and hard, using creatine phosphate to quickly produce ATP.

- The glycolytic system is involved in intense work for up to a few minutes. This one uses glucose (or carbs) to produce energy. Like the phosphagen system, this one initially works without oxygen, making them both anaerobic systems.

- The oxidative system, or aerobic system, accounts for longer, endurance events. It uses carbs and fat to produce ATP for energy and requires oxygen to do so.

While exercise duration and intensity will spark one of these systems more than the other, they all work in tandem, Prescott notes.

Keep this general rule in mind: "Longer periods of work combined with shorter rest periods will help improve the efficiency of the aerobic energy systems," Letchford says. "Shorter periods of work combined with relatively longer rest will help improve the efficiency of the anaerobic energy systems."

Benefits of metabolic conditioning

You can do a metabolic conditioning workout in a number of ways, which means there's a long list of potential benefits:

It can improve your fitness performance

Prescott says metcon workouts can be great for enhancing cardio performance. If you're training for power with quicker bursts of work and longer rest, it can also improve your speed or jumping ability. If you're training aerobically, metcon can improve your endurance or a goal like your mile time, Prescott says. Research backs up metcon's ability to improve the body's metabolic and cardiorespiratory response1, too.

It's super time-efficient

"If you're smart about how you create your workout program, you don't need 45 to 60 minutes," Prescott says. In other words, metcon helps you make the most out of shorter sweat sessions2.

Because metcon often includes lifting, working multiple muscle groups at one time, you'll feel breathless and fatigued during that work period. "When your muscles experience fatigue, the body's hormonal response results in an increase in muscular strength and cross-sectional area (aka muscle size)," Letchford says. "Whil