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Moderate evidenceTraining method

Circuit training

Circuit training moves from one resistance exercise to the next with little rest. Meta-analyses show it improves aerobic fitness, strength and body composition at the same time, a useful package when time is short. The gains in each are moderate; dedicated programs still do more for maximal strength or endurance on their own.

What the science says

  • Improves aerobic fitness Moderate evidence

    A meta-analysis of 45 studies (Ramos-Campo et al., 2021) found circuit training raised VO2max by 6.3%; an earlier meta-analysis (Muñoz-Martínez et al., 2017) also found significant VO2max gains compared with control groups in healthy adults.

  • Builds strength in upper and lower body Moderate evidence

    Both meta-analyses found strength gains, including bench press 1RM (Muñoz-Martínez et al., 2017) and upper- and lower-limb strength (Ramos-Campo et al., 2021); the size of the gain depended on the number of sessions, frequency and training status.

  • Small gains in muscle, some loss of fat Moderate evidence

    Ramos-Campo et al. (2021) found muscle mass rose by 1.9% and fat mass fell by 4.3%; lower to moderate loads with short rest between exercises were linked to more fat loss.

  • Dose matters for aerobic gains Moderate evidence

    Muñoz-Martínez et al. (2017) found the largest VO2max effects with about 14–30 sessions over 6–12 weeks, sessions of at least 20–30 min, and loads around 60–90% of 1RM.

How to apply it

Pick 6–10 exercises that alternate body regions, move between them with short rest, and repeat the circuit.

Program length6–12 weeks, about 14–30 sessions
Session lengthAt least 20–30 min of circuit work
LoadLight to moderate (about 30–60% of 1RM) for strength in less-trained people; up to 60–90% for the largest VO2max effects
Rest between stationsShort, about 15–30 s
Frequency2–3 sessions per week

Who should be careful

Moving fast between stations raises heart rate and fatigue; keep technique strict and choose exercises you already know. If you are sedentary or have heart disease, high blood pressure or another medical condition, get medical clearance before hard circuit work.

Frequently asked questions

Does circuit training improve cardio and strength at the same time?

Yes. Meta-analyses found gains in VO2max (about 6%) and in upper- and lower-body strength.

Does circuit training help with fat loss?

Modestly. One meta-analysis found a 4.3% drop in fat mass and a 1.9% rise in muscle mass, with more fat loss at lower loads and short rest.

How long until it works?

The largest aerobic effects came after about 14–30 sessions over 6–12 weeks, with sessions of at least 20–30 min.

Scientific references

More training methods

  • Drop sets Moderate evidence

    A drop set takes a set to failure, then immediately cuts the load and keeps going.

  • Rest-pause sets (including myo-reps) Limited evidence

    Rest-pause means taking a set close to failure, resting 15–30 seconds, then squeezing out a few more reps, repeated a few times.

  • Supersets Moderate evidence

    A superset pairs two exercises back to back with little or no rest.

  • High-intensity interval training (HIIT) Strong evidence

    HIIT alternates short hard efforts with recovery.

  • Zone 2 training Limited evidence

    Easy, steady cardio clearly improves fitness and health, but the popular claim that "Zone 2" is a special, optimal intensity for building mitochondria and burning fat is not supported.

  • Fasted training (fasted cardio) Limited evidence

    Training on an empty stomach burns more fat during the session, but that does not translate into more fat lost over weeks.