Your essential guide to high-intensity circuit training
Written by Martin Ebner
Updated October 2026
High-intensity circuit training had a brilliant sales pitch. Combine strength and cardio, take away most of the rest and get an entire workout finished before a traditional gym session has properly got going. For a while, every fitness class became a circuit and every rest period started looking suspicious.
I understand why it became popular. A well-organised circuit can be efficient, challenging and a lot of fun. It can improve several areas of fitness at once and leave you feeling as though you’ve trained properly.
It can also become thirty minutes of rushing between exercises while your technique, strength and original reason for being there gradually disappear.
My position is simple. High-intensity circuit training works, but it isn’t magic and it isn’t how I’d build somebody’s entire training program.
WHAT HIGH-INTENSITY CIRCUIT TRAINING IS
High-intensity circuit training, usually shortened to HICT, involves completing several exercises in sequence with relatively short recovery periods. A circuit might combine squats, presses, rows, carries and a cardiovascular station such as a bike or rowing machine.
Once every exercise has been completed, you rest before beginning the next round. The shorter rests and constant movement raise your heart rate, while the resistance exercises challenge your muscles.
There isn’t one official HICT formula. Some circuits use bodyweight exercises, some use weights and others mix resistance training with running, cycling or rowing. The quality of the session depends far more on the exercise selection, load, rest and progression than it does on the HICT label.
HICT ISN’T THE SAME AS HIIT
High-intensity interval training usually alternates hard cardiovascular efforts with easier recovery periods. Sprinting hard on a bike for thirty seconds, recovering for ninety seconds and repeating the sequence would be HIIT.
High-intensity circuit training moves between different exercises. Your legs might be working during a squat, your upper body during a push-up and your heart and lungs during a rowing interval.
There’s some overlap, particularly when circuit workouts include hard cardio stations, but they aren’t identical. I’ve covered the distinction and the wider fat-loss argument in HIIT vs long-distance cardio.
WHAT CIRCUIT TRAINING CAN DO WELL
Circuit training is useful when time is limited and you want to challenge several aspects of fitness in one session. You can train the main movement patterns, raise your heart rate and complete a decent amount of work without spending the entire evening in the gym.
A review of 45 studies found that resistance-based circuit training could improve strength, cardiorespiratory fitness and body composition. A smaller five-week trial involving sedentary women also found improvements in aerobic fitness and several measures of strength.
That doesn’t mean circuits are the best method for every individual goal. It means they’re capable of producing useful results, particularly when somebody wants a broad mixture of strength and fitness from a limited amount of training time.
They can also be extremely enjoyable. Moving through a properly planned circuit gives the session momentum, and the variety can make thirty minutes disappear remarkably quickly.
WHAT IT WON’T DO FOR YOU
Circuit training doesn’t allow you to build maximum strength, enormous amounts of muscle and elite cardiovascular fitness simultaneously. Those goals place different demands on the body and usually benefit from more specific training.
If maximum strength is the priority, you’ll normally perform better with heavier weights and longer rests. If muscle growth is the priority, you need enough load, productive sets and progression rather than simply moving continuously. If endurance is the priority, dedicated cardiovascular training allows you to perform considerably more sustained work.
A circuit can contribute to all three, but it won’t replace a well-designed strength or endurance program.
The same applies to fat loss. Circuit training uses energy and may help create the calorie deficit required to lose body fat, but there’s nothing uniquely fat-melting about moving quickly between kettlebells and a rowing machine. Food intake, daily activity and consistency still decide the wider result.
THE AFTERBURN EXISTS, BUT CALM DOWN
Hard circuit training can increase energy expenditure after the workout while your body returns to its resting state. This is called excess post-exercise oxygen consumption, or EPOC.
The effect is real. The marketing around it became ridiculous.
In one small study of circuit weight training, shorter rests increased energy expenditure during the first hour of recovery. The difference between the short-rest and longer-rest sessions was around fifteen calories. Interestingly, the workout using longer rests still produced greater total energy expenditure once the training and recovery periods were combined.
You may continue using a little more energy after a demanding circuit, but you haven’t started a second invisible workout that lasts for two days. Don’t sacrifice the quality of the session to chase an afterburn effect.
REST ISN’T CHEATING
The old version of this article recommended resting as little as possible. That’s how circuit training quickly turns into a collection of increasingly poor repetitions.
Shorter rests are part of the method, but they still need to be long enough for you to perform the next exercise properly. Alternating different muscle groups helps because your legs can recover while your upper body works, but your overall fatigue will continue to build.
A comparison of high-intensity circuit training and traditional strength training found greater peripheral fatigue after the circuit session, even when the overall workload and recovery for each muscle group were matched.
For most circuits, I’d start with roughly twenty to forty seconds between exercises and ninety seconds to two minutes between rounds. Take longer if your breathing, grip or technique hasn’t recovered. The stopwatch doesn’t get to overrule common sense.
CHOOSE EXERCISES THAT SURVIVE FATIGUE
Circuit training isn’t the place for your most technical exercises. Heavy barbell deadlifts, complicated Olympic lifts and maximal box jumps become increasingly poor choices as fatigue builds.
I’d rather use exercises that are easy to control and simple to adjust. Goblet squats, push-ups, dumbbell presses, rows, reverse lunges, kettlebell deadlifts, loaded carries, bikes and rowing machines all work well.
That doesn’t mean the exercises should be easy. It means you should still recognise them during the final round.
Choose a load that leaves around two good repetitions available at the end of each station. You should be working hard, but you shouldn’t be reaching failure six times in ten minutes.
A CIRCUIT I’D USE
Warm up for five to eight minutes using easy cardiovascular work and controlled versions of the exercises you’re about to perform. The warm-up should prepare you for the session, not become the first round by stealth.
Complete the following circuit:
Goblet squat: 8 to 10 repetitions
Push-ups or dumbbell floor press: 8 to 12 repetitions
One-arm dumbbell row: 8 to 10 repetitions on each side
Reverse lunge: 6 to 8 repetitions on each side
Farmer’s carry: 30 to 40 seconds
Bike or rowing machine: 40 seconds at a hard but controlled pace
Rest for twenty to forty seconds between exercises where needed, then take ninety seconds to two minutes between rounds. Begin with three rounds.
The first round should feel controlled. The second should feel demanding. During the third, you should still be able to produce good repetitions without turning every movement into a completely different exercise.
If the final round becomes a negotiation between you and a kettlebell, you’re finished whether the stopwatch agrees or not.
HOW TO PROGRESS THE WORKOUT
Circuits still need progressive overload. Repeating the same exercises with the same weights and the same number of rounds will eventually stop creating much of a challenge.
Track the weights and repetitions you use. When you can complete all three rounds with good form and consistent performance, increase one variable. Add a small amount of weight, perform another repetition at each station or add a fourth round.
Don’t increase everything at once. Making the weights heavier, adding another round and removing thirty seconds of rest is three changes, not one progression.
My guide to progressive overload explains how to build progression without turning every workout into a test.
HOW OFTEN SHOULD YOU DO IT
One or two circuit sessions per week will be enough for most people. They can replace a conventional workout when time is tight, provide a conditioning session alongside strength training or simply add some variety for a few weeks.
What I wouldn’t do is add two demanding circuits on top of three hard strength sessions and pretend they don’t count because they’re short. High-intensity work still creates fatigue, regardless of how efficiently it fits into your calendar.
If strength or muscle is your main priority, protect the quality of those sessions first. My guide to combining cardio and strength training covers how to organise both without having them compete unnecessarily.
DO YOU NEED A PRE-WORKOUT
No. Water, food and a decent night’s sleep will cover the important work.
If you train early, arrive at the gym after a long working day or simply enjoy using a pre-workout, Pre Lab Pro is the one I’d consider. It may help with energy and focus, but it won’t rescue poor exercise selection or turn a random circuit into a good program.
WHEN A CIRCUIT ISN’T THE RIGHT SESSION
Skip the circuit if you’re learning unfamiliar exercises, returning after a long break or trying to improve maximum strength on a particular lift. In those situations, more rest and a slower session will usually let you practise and perform considerably better.
You should also adjust the session if a medical condition, current injury or medication makes high-intensity exercise inappropriate. That doesn’t automatically mean avoiding circuits forever. It means choosing the right intensity and getting professional medical guidance where it’s needed.
Hard breathing, tired muscles and a rising heart rate are expected. Sharp pain, dizziness or feeling unwell aren’t signs that the workout is finally becoming effective.
USE THE CIRCUIT, DON’T LET IT USE YOU
High-intensity circuit training can improve strength, fitness and work capacity while fitting plenty into a relatively short session. It can also be great fun, which is a perfectly valid reason to include it.
Just give the workout a purpose. Choose exercises you can perform well, rest long enough to keep them recognisable and progress something measurable over time.
I don’t use circuit training as the foundation of my own training or coaching, but I’m not against it. Used occasionally and programmed properly, it can provide a very effective change of pace. Used as an excuse to rush through random exercises until everyone collapses, it’s little more than fitness theatre.
If your workout needs a timer, three buzzwords and somebody shouting at you before it feels effective, Check It Oot is where I separate useful training from the theatre surrounding it. One email once or twice a month, written by me and delivered straight to your inbox.
