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Minimalist Training for Muscle Growth
The Core Elements Approach
Core Elements is for people who want to build or maintain muscle while making room for work, family and everything else. FBY’s minimalist muscle-building program, now available with Pro, gives tradies, busy parents and shift workers a manageable amount of challenging training, with clear progression and room to adjust when life gets demanding.
A minimalist training plan for a busy week
Choose two, three or four sessions per week, designed to fit within an hour. The ten-week program is organised into two five-week blocks, with the option to finish, continue or change programs after the first block. Session times are estimates: warm-ups, equipment availability and individual needs all matter.
Can you build muscle training twice a week?
Yes, it can be enough to make progress. In an eight-week study, young, resistance-trained adults improved muscle size and strength with one set of nine exercises, twice weekly. Both training to failure and stopping two repetitions short produced gains; some muscle-growth measures tended to favour failure, with generally modest differences.[1] Higher-volume training has also produced greater growth at several measured sites.[2] A lower-volume approach can be useful when time is limited, while higher volumes may offer more scope for maximising muscle growth.
Maintaining muscle can require less training than building it initially. One study found that younger adults retained muscle gains after substantial reductions in training dose, while older adults did not retain the same gains on those reduced prescriptions.[3] Maintenance needs vary, so this does not establish a universal minimum or guarantee what an experienced lifter will retain. For practical ideas around a demanding schedule, read our guide to maintaining muscle and strength through long hours.
How to progress your reps, weight and sets
Core Elements uses double progression: build clean repetitions within the prescribed range, then increase weight once every prescribed set reaches the upper limit at the required effort on a Green session. Research supports repetition progression and load progression as viable approaches.[4] Our particular combination and progression rules are coaching choices. Hold weight on the first added-set or lower-RIR exposure and on the week-6 reset.
The full planned Green totals are 22 weekly work sets in weeks 1–2, 24 in weeks 3–7 and 26 in weeks 8–10 when additions are accepted at the earliest offers and fit the time budget. These are whole-program totals, not sets per muscle. Each training frequency distributes that work differently. At each planned increase, review the affected exercises and estimated time, then choose Add sets or Keep current. You can return to your previous volume while keeping your saved weights and training history. Performance, recovery and available time still guide these choices.
Using RIR to manage effort and recovery
Effort is prescribed using repetitions in reserve, or RIR: an estimate of how many more clean repetitions you could complete. Weeks 1–3 and 6–8 generally use 2 RIR. In weeks 4–5 and 9–10, other compound exercises can reach 1–2 RIR and isolation exercises around 1 RIR. Green squat/hinge slots stay at 2 RIR.
An optional final isolation set may reach 0–1 RIR only when recovery is Green, technique remains controlled and the exercise is safe to stop. Forced and failed repetitions are not part of the plan. A final set logged at 0 RIR cannot qualify that exposure for a weight increase.
This approach draws on research comparing gradually changing RIR targets with a constant harder target. Both groups improved, without statistically significant differences in muscle or strength gains, while the varying-RIR group reported lower session effort.[5] The study did not test our exact schedule. Week 6 resets the prescription to 2 RIR; persistent fatigue calls for a fuller recovery adjustment.
How much training do you need?
Dr Mike Israetel and Renaissance Periodization’s volume landmarks also informed the program’s development.[6] These describe:
- MV, Maintenance Volume: the amount of training needed to maintain existing muscle.
- MEV, Minimum Effective Volume: the minimum amount expected to produce growth.
- MAV, Maximum Adaptive Volume: the range expected to produce the best growth.
- MRV, Maximum Recoverable Volume: the most training someone can currently recover from.
We use these as individual, muscle-specific coaching estimates. The program’s set totals are planned Green weekly targets, not measured landmarks or scientifically established optimal numbers. Our guide to hypertrophy for tradies explains how we apply volume landmarks.
The FBY colour system makes day-to-day adjustments clearer. Green follows the plan. Amber reduces the work and effort and holds progression. Red means resting or stopping affected work. Weight increases must respect the current RIR target: getting more reps by pushing closer to failure does not automatically show improved strength. If your job adds physical fatigue, our guide to training after a physical job covers how to adapt your sessions.
Making shorter gym sessions work
Free-weight compound exercises anchor the program, with alternatives for equipment and preference. Optional supersets can save time, although research suggests they can also feel more demanding.[7] Main-lift rest still takes priority.
Useful exercises stay consistent, with optional changes between blocks. One small study found improved motivation when exercises and repetition ranges varied between sessions.[8] That offers a reason to allow some flexibility, without establishing that frequent changes are necessary or that our between-block approach has the same effect.
Our aim is consistent, measurable training that fits alongside a demanding life. Research informs the principles; your progress, recovery and available time guide how they are applied.
References
[1] Hermann, T., et al. (2025). Without Fail: Muscular Adaptations in Single-Set Resistance Training Performed to Failure or with Repetitions-in-Reserve. Medicine & Science in Sports & Exercise, 57(9), 2021–2031.
[2] Schoenfeld, B. J., et al. (2019). Resistance Training Volume Enhances Muscle Hypertrophy but Not Strength in Trained Men. Medicine & Science in Sports & Exercise, 51(1), 94–103.
[3] Bickel, C. S., Cross, J. M., & Bamman, M. M. (2011). Exercise dosing to retain resistance training adaptations in young and older adults. Medicine & Science in Sports & Exercise, 43(7), 1177–1187.
[4] Plotkin, D., et al. (2022). Progressive overload without progressing load? The effects of load or repetition progression on muscular adaptations. PeerJ, 10, e14142.
[5] Martikainen, O., et al. (2025). Influence of Varying Proximity-to-Failure on Muscular Adaptations and Repetitions-in-Reserve Estimation Accuracy in Resistance-Trained Individuals. Journal of Science in Sport and Exercise.
[6] Renaissance Periodization. (2017, 4 January). Training Volume Landmarks for Muscle Growth. RP Strength. Coaching framework, not a clinical trial. Accessed 30 October 2026.
[7] Zhang, X., et al. (2025). Superset Versus Traditional Resistance Training Prescriptions: A Systematic Review and Meta-analysis Exploring Acute and Chronic Effects on Mechanical, Metabolic, and Perceptual Variables. Sports Medicine, 55(4), 953–975.
[8] Baz-Valle, E., et al. (2019). The effects of exercise variation in muscle thickness, maximal strength and motivation in resistance trained men. PLOS ONE, 14(12), e0226989.