What is a circuit workout?

A circuit is a group of exercises done one after another with little or no rest in between. Once you've done every exercise, that's one round. You rest briefly, then go around again, usually for 2 to 5 rounds.

For example, a simple bodyweight circuit might be:

1. Squats for 40 seconds
2. Push-ups for 40 seconds
3. Reverse lunges for 40 seconds
4. Plank for 40 seconds
5. Jumping jacks for 40 seconds

Do each one, rest 20 seconds between exercises, rest a minute after the last one, and repeat three times. That's a complete 20-minute workout.

How circuit training works

Circuits move you from one exercise to the next so that while one muscle group rests, another works. That keeps your heart rate up for the whole session, which is why a circuit feels like a mix of strength training and cardio.

Every circuit is built from a few settings:

• Exercises: usually 4 to 10, often alternating upper body, lower body and core.
• Work: how long you do each exercise (like 40 seconds) or how many reps (like 12).
• Rest: the short break between exercises, often 10 to 30 seconds, or none at all.
• Rounds: how many times you go through the whole list.
• Rest between rounds: a longer break, usually 1 to 3 minutes.

Timed circuits vs. rep circuits

There are two common ways to run a circuit.

Timed circuits give each exercise a fixed amount of time, like 40 seconds on and 20 seconds off. They're easy to follow with a timer, keep a group in sync, and let everyone work at their own pace. You do as many good reps as you can in the time. Our free circuit timer is built for these.

Rep circuits give each exercise a target number of reps, like 10 kettlebell swings, then you move on. They work well with weights, because you can choose a load that suits the rep count.

What circuit training is good for

• Getting a lot done in a short time. A full-body workout in 20 to 30 minutes.
• Conditioning. Moving with little rest builds work capacity and improves cardiovascular fitness.
• Muscular endurance. Lots of reps with short rests trains muscles to keep going.
• Training with little equipment. Many great circuits need nothing but your bodyweight.
• Variety. Circuits are easy to change, which helps keep training fun.

What circuits aren't great for

Circuits are not the best way to build maximal strength. Getting as strong as possible needs heavy weights and longer rests between sets, so you can give each set your best effort (see how long to rest between sets). Short-rest circuits leave you too out of breath to lift truly heavy loads safely.

That's why many lifters use both: heavy strength work first, then a short circuit at the end of the session as a finisher, or circuits on separate conditioning days.

Circuit training vs. HIIT vs. Tabata

These terms overlap, and people use them loosely.

A circuit can be HIIT if you push hard during the work periods, and a Tabata can be one exercise or a circuit of several.

Frequently asked questions

How many exercises should be in a circuit?

Four to eight is a good range. Fewer than four feels repetitive, and more than ten makes each round long and hard to remember.

How many times a week can I do circuit training?

Two to four sessions a week works for most people. If you also lift heavy, keep circuits short and avoid doing them right before heavy leg days.

Can circuit training build muscle?

Yes, especially for beginners and when you use weights that make the last few reps of each exercise hard. For the most muscle and strength, combine circuits with regular strength training.

Do I need equipment for a circuit?

No. Squats, lunges, push-ups, planks, mountain climbers and burpees make a complete circuit. Adding dumbbells or a kettlebell gives you more options as you get fitter.