The Minimum Effective Dose: How 3 Hours a Week Builds Real Strength | Catalyst Performance

Apr 6

The Minimum Effective Dose: How 3 Hours a Week Builds Real Strength

By Bervin M, Co Founder of Catalyst Performance

"I know I should be training. I just don't have the time."

I hear this almost every week. From executives, from founders, from working parents. And I understand it. When you are managing a career, a family, and everything else that comes with life in Singapore, finding time to train feels like a luxury you cannot afford.

But here is the part that most people get wrong: effective strength training does not require the time commitment you think it does. The research is clear on this, and the number is probably lower than you expect.

What the Research Actually Says About Training Volume

One of the most cited researchers in exercise science, Brad Schoenfeld, has published multiple systematic reviews and meta analyses on the relationship between training volume, frequency, and results. Here is what the data shows.

A meta analysis published in the Journal of Sports Sciences (Schoenfeld et al., 2016) found that training each major muscle group at least twice per week produced superior hypertrophy (muscle growth) compared to once per week. But the difference between two and three times per week? Minimal. When total training volume was held constant, two and three sessions per week produced statistically similar results for both muscle growth and strength gain.

A separate study published in the Journal of Strength and Conditioning Research (Colquhoun et al., 2018) directly compared trained men following identical programmes spread across two versus three days per week over 10 weeks. The conclusion: similar increases in muscular adaptations, with effect sizes actually favouring the two day protocol for muscle mass.

What does this mean practically? If you are training with adequate intensity and hitting each muscle group with sufficient volume across the week, you do not need to be in the gym five or six days. Two to three focused sessions per week is the evidence based sweet spot for the vast majority of people.

The "More Is Better" Myth

The fitness industry has a financial incentive to make you believe you need more. More sessions. More supplements. More complexity. More time.

The research tells a different story. A 2024 overview published in Sports Medicine reviewed minimal dose resistance exercise strategies and found that even remarkably low volumes of training, as few as one to two working sets per muscle group per session, produce meaningful strength gains in general populations. The gains from additional volume follow a curve of diminishing returns: the jump from zero sessions to two sessions per week is enormous. The jump from three sessions to five sessions is marginal by comparison.

This is the concept of the minimum effective dose (MED): the smallest input that produces the desired outcome. In pharmacology, you do not take more medicine than needed. In training, the same principle applies. More volume beyond the MED does not produce proportionally more results. It produces more fatigue, more time commitment, and more risk of burnout or injury.

For busy professionals, this is the most important concept in exercise science. You do not need to find 10 hours a week. You need to find three.

What 3 Hours a Week Actually Looks Like

At Catalyst Performance, the majority of our clients train with us twice a week and complete one to two additional self training sessions guided by programmes we build for them through our training app. That totals three to four sessions per week, roughly three hours of training time. Here is how the coached sessions are structured to maximise results within that window.

Every session follows the same architecture

Warm up and activation (10 minutes): Targeted mobility work and neuromuscular activation specific to the session's primary movements. This is not mindless treadmill walking. It prepares your joints, nervous system, and stabilisers for the work ahead.

Primary strength work (35 to 40 minutes): Compound movements programmed with progressive overload. This is where the actual adaptation happens. Movements are selected based on our Four Pillar Assessment results, targeting the specific areas where each client needs the most improvement.

Accessory and conditioning work (10 to 15 minutes): Targeted work addressing individual weaknesses, asymmetries, or metabolic health goals. This is where grip strength, stability, and cardiovascular conditioning are woven in.

Two coached sessions per week. One to two guided self training days. Roughly three hours total. No filler. Every minute has a purpose.

Why Structure Matters More Than Time

The uncomfortable truth is that most people who spend five or six hours a week in the gym are not getting five or six hours worth of results. They are doing exercises they saw on Instagram. They are repeating the same routine they have followed for years. They are resting too long or not long enough. They are training muscles they enjoy and neglecting the ones they need.

A structured, coached programme that runs three hours per week will outperform an unstructured six hours per week almost every time. Here is why:

Progressive overload is tracked. Without systematic progression (more weight, more reps, more range of motion over time), your body has no reason to adapt. Most self directed gym goers lift the same weights for months or years. A coached programme ensures you are progressing at the right rate, every session.

Exercise selection is intentional. Instead of doing whatever feels good, every movement in a structured programme is selected to address specific assessment outcomes. If your body composition analysis shows low muscle mass in your lower body, your programme reflects that. If your grip strength is lagging, we address it directly.

Recovery is built in. Three sessions per week with rest days in between allows your nervous system and musculoskeletal system to recover and adapt. This is when the actual gains happen. More training without adequate recovery does not build more muscle. It builds more cortisol.

The Real Barrier Is Not Time. It Is Priority.

I say this with respect, because I work with busy people every day: if you have time for a 45 minute commute, a one hour lunch meeting, and 30 minutes of social media scrolling in the evening, you have time for three one hour training sessions per week.

The barrier is rarely time. It is that strength training has not been framed as a non negotiable in the same category as a work meeting or a medical appointment. And that framing gap exists because the fitness industry has positioned training as optional, as a lifestyle choice, as something you do when you have the bandwidth.

The data on Singapore's ageing population says otherwise. Strength training is the most effective intervention for preventing sarcopenia, metabolic disease, falls, and loss of independence. It is not a nice to have. For anyone who wants to age with capability rather than decline, it is essential.

Three hours a week is the minimum effective dose. It is also, for most people, the maximum they need.

What About Cardio?

This is the follow up question I always get. "If I'm only doing three strength sessions, where does cardio fit in?"

Two points here. First, a well structured strength session with controlled rest periods and compound movements already produces a significant cardiovascular stimulus. Your heart rate will be elevated. Your cardiovascular system will be challenged. This is not the same as a dedicated Zone 2 session, but it is not nothing.

Second, if you want to add dedicated cardiovascular work (and I recommend it, particularly for low intensity steady state cardio and heart rate recovery improvement), you do not need a gym for that. A 30 minute walk, a bike ride, a swim. These can be layered on top of your three strength sessions without competing for recovery resources. The key is that they supplement the strength work. They do not replace it.

The Takeaway

You do not need more time. You need a better programme.

The research is clear: two to three structured strength training sessions per week, with adequate intensity and progressive overload, produces the vast majority of strength and muscle building results. Additional volume beyond this point follows a steep curve of diminishing returns.

If you are a busy professional in Singapore telling yourself you will start training "when things slow down," things are not going to slow down. What can change is how you use three hours of your week. That is less than 2% of your waking time. And the evidence says it is enough to fundamentally change your health trajectory.

The question is not whether three hours is enough. It is whether you are willing to commit them.

Catalyst Performance is a strength and conditioning studio in Singapore. Our clients train with us twice per week and follow guided self training programmes on the days in between, built around evidence based assessment protocols that measure the biomarkers of healthy aging. If you want to see what a structured programme looks like, book a consultation.

References

Schoenfeld, B. J., Ogborn, D., & Krieger, J. W. (2016). Effects of resistance training frequency on measures of muscle hypertrophy: A systematic review and meta analysis. Sports Medicine, 46(11), 1689 to 1697.
Schoenfeld, B. J., Ogborn, D., & Krieger, J. W. (2017). Dose response relationship between weekly resistance training volume and increases in muscle mass. Journal of Sports Sciences, 35(11), 1073 to 1082.
Colquhoun, R. J., et al. (2018). Training volume, not frequency, indicative of maximal strength adaptations to resistance training. Journal of Strength and Conditioning Research, 32(5), 1207 to 1213.
Androulakis Korakakis, P., et al. (2024). Resistance exercise minimal dose strategies for increasing muscle strength in the general population: an overview. Sports Medicine, 54, 1289 to 1304.
Schoenfeld, B. J., Grgic, J., & Krieger, J. W. (2019). How many times per week should a muscle be trained to maximize muscle hypertrophy? A systematic review and meta analysis. Journal of Sports Sciences, 37(11), 1286 to 1295.

Bervin Manoharan