Time-efficient strength training: what actually works

Lack of time ranks as one of the most commonly cited reasons people skip or abandon strength training. A 2021 narrative review by Iversen and colleagues, published in the Journal of Strength and Conditioning Research, addressed this question directly: can you build strength and muscle in a genuinely time-efficient way without compromising results? Three strategies came out of that review. First, build sessions around bilateral multi-joint exercises such as squats, bench press, and rows. These movements recruit several large muscle groups simultaneously, covering more training ground per exercise. The review identified as few as four sets per muscle group per week, using loads in the 6-15 rep range, as a sufficient minimum to drive hypertrophy. Second, use advanced techniques like supersets and rest-pause methods. These approaches can nearly halve session time while maintaining training volume and hypertrophy potential. Third, skip lengthy general warm-ups. Exercise-specific warm-up sets are all most people need before their working sets.

Multi-joint exercises: the fastest way to cover ground

The first strategy is also the simplest: build sessions around bilateral multi-joint exercises. A squat loads the quads, glutes, hamstrings, core, and lower back at the same time. A bench press trains the chest, shoulders, and triceps together. A row works the back, rear shoulders, and biceps in one movement — elbow position determines which of those muscles leads the pull.

Compare that with an isolation-heavy approach. A leg extension works the quads. A hamstring curl works the hamstrings. You need twice the exercises to cover the same muscle groups.

For someone training with limited time, multi-joint exercises are the obvious foundation. Fewer exercises are needed to stimulate the same amount of muscle, which means shorter sessions without sacrificing the stimulus that drives adaptation.

The volume minimum is also more accessible than most people expect. Four sets per muscle group per week, using 6-15 rep loading, is enough to build muscle consistently. That threshold sits below what most people assume is necessary, and it can be reached in two or three short sessions rather than five or six longer ones.

Advanced techniques to compress session time

The second strategy is to use condensed training methods that let you fit more meaningful work into less time.

Supersets pair two exercises back to back with no rest in between. When the exercises target different muscle groups, one muscle rests while the other works. Total time per exercise pairing is roughly halved compared with taking full rest between separate exercises. The muscle that is resting still gets adequate recovery.

Rest-pause and myo-reps apply a similar principle to individual sets. After a set taken close to failure, you rest for around 10-15 seconds, then complete a short cluster of 2-5 reps before another brief rest. This accumulates more effective reps near failure in less total time than a standard straight-set approach.

Both methods share an important caveat: they work best on isolation exercises towards the end of a session. Applying rest-pause sets to heavy squats or deadlifts creates significant fatigue early in a workout, which degrades the quality of everything that follows. Save these techniques for lighter accessory work, such as curls, lateral raises, or cable exercises, where the fatigue cost is lower and manageable.

When applied selectively, the Iversen review suggests these techniques can nearly halve session duration while maintaining the volume and training stimulus needed for hypertrophy.

Why you can skip the long warm-up

The third strategy is the one that surprises most people.

Long general warm-ups, including extended dynamic mobility sequences, do not meaningfully reduce injury risk for healthy people doing resistance training. The evidence on this point is consistent, and it matters practically because a 15-minute warm-up routine removes 15 minutes from your actual training time.

What does make a difference is an exercise-specific warm-up: one or two lighter sets before your working sets on each exercise, using the same movement pattern with reduced load. A couple of warm-up sets on the bench press prepare the shoulder joint, sharpen the motor pattern, and raise tissue temperature in the specific muscles being trained. That takes three or four minutes.

The exception: if mobility or flexibility is an explicit goal for you, structured stretching earns its place. If it is not, putting that time into working sets is a legitimate, evidence-based choice.

What this means in practice

A session built around three or four multi-joint exercises, using supersets to pair movements targeting different muscle groups, with exercise-specific warm-up sets only, can consistently deliver the volume needed for muscle and strength development in under 45 minutes.

That is not a shortcut. It is a structure that reflects what the evidence says drives results: total volume per muscle group, effort applied to each set, and consistency over time. For anyone pursuing online personal training around a busy schedule, compact sessions are often more sustainable precisely because they remove the barrier of needing a large, uninterrupted block of time.

Simple, focused sessions done consistently outperform long, complex routines that happen sporadically. That principle is backed by research, and it shapes how well-designed programmes handle the real constraint of limited time.

Advanced techniques like supersets can nearly halve session time while maintaining hypertrophy potential

Iversen VM et al., “No Time to Lift? Designing Time-Efficient Training Programs for Strength and Hypertrophy: A Narrative Review,” Journal of Strength and Conditioning Research, 2021.

For a closer look at structuring recovery within these shorter sessions, see how long to rest between sets.