Any Progressive Program Works: Start and Keep Training
Any structured, progressive resistance-training program reliably increases strength and muscle size; a minimum regular dose improves muscle structure and function, so the practical reading is to start and keep training.
Individual response varies; those with medical conditions should consult a professional before intensive training.
- Persistent pain or symptoms that do not resolve with rest
- Exertional chest pain, dizziness or breathlessness
What the evidence says
The sources are meta-analyses of resistance-training prescriptions and their effect on strength and muscle. Currier 2023 (meta-analysis) reports that any resistance-training program is beneficial for muscle strength and hypertrophy, with higher loads favouring strength and multiple sets favouring hypertrophy; Lyristakis 2024 (meta-analysis) reports large pooled improvements in strength (SMD at least 1.3) and concludes that training volume and duration should be prioritised for developing strength; Borde 2015 (meta-analysis) reports improved strength in healthy older adults (mean SMD 1.57), larger with the longest training periods; Edouard 2023 (meta-analysis) concludes that as soon as individuals start training at a certain minimum dosage regularly, it is effective at improving muscle structure and function.
- (myth: If you can't train a lot, there's no point.) CORRECTION: A minimum regular dose reliably improves muscle structure and function; the pragmatic reading is to just start and keep training.
- (myth: Single-set training is useless.) CORRECTION: Any resistance-training program is beneficial for muscle strength and hypertrophy, and a minimum regular dose reliably improves muscle structure and function.
- Does not diagnose, treat, or cure any disease or injury
- Not a substitute for individualized medical or physical-therapy advice
- Results vary between individuals; no guaranteed outcome
- Agreement
- consistent for this claim. Direction recorded for 3 of 4 sources; not yet recorded for the rest.
- The claim's outcome
- Outcome not yet recorded
- Certainty
- No source states a certainty rating.
What each source measured and concluded (4)
- What it measured
- Muscle strength and hypertrophy.
- How it measured it
- Muscle strength: 1RM test, isometric maximum voluntary contraction, isokinetic maximum voluntary contraction. Muscle hypertrophy: Ultrasonography, MRI, CT, bioelectrical impedance, dual-energy X-ray absorptiometry, hydrostatic weighing, air displacement plethysmography, microscopy.
- How it was read
- read in full text
- What the review says it includes
- systematic review and meta-analysis
- Studies and participants, as stated
- N = 8,461 participants across 192 studies
- What it measured
- Muscle strength (chest and quadriceps)
- Direction it states for the claim's outcome
- Improved
- How it was read
- read in full text
- What it measured
- Muscle strength (via 1RM and MVC) and muscle morphology (via MRI, CT, DEXA, ultrasound, or BOD POD).
- How it measured it
- Validated measures such as 1RM and MVC for strength; MRI, CT, DEXA, ultrasound, or BOD POD for muscle morphology.
- Direction it states for the claim's outcome
- Improved
- How it was read
- read in full text
- What the review says it includes
- meta-analysis, systematic review
- Studies and participants, as stated
- N = 819 participants across 25 studies
- Heterogeneity, as stated
- Considerable large heterogeneity (I2 = 80%)
- What it measured
- Muscle strength, hypertrophy, and physical function.
- How it measured it
- Systematic review and Bayesian network meta-analysis of existing studies.
- Direction it states for the claim's outcome
- Improved
- Its conclusion, in its own words
- “It is highly encouraging to see that as soon as individuals start training at a certain minimum dosage regularly, it is effective at improving muscle structure and function.”
- How it was read
- read in full text
Each source below is shown with its study design and a link to the original study, or, where it is not a completed research paper, with what kind of record it is; those are not counted. This is the audit trail.
Why do some records show a record type instead of a study design?
A study design is shown for a completed, peer-reviewed paper. A registered protocol, a preprint, a conference abstract, a referee report or a book chapter has not been through peer review as a finished paper, so it is labelled for what it is, and it is counted in no source count. Where a record could not be confirmed as a completed paper at all, it says so rather than guessing. They all stay in the list, and their DOI still resolves, because the count of what was screened is part of the audit trail.
- Protocol / registration A registered plan for a review or trial, not its results.
- Preprint Posted by its authors before peer review.
- Conference abstract A conference summary rather than a peer-reviewed paper.
- Peer-review report A referee's report on a paper, not the paper itself.
- Guideline / position stand A recommendation derived from evidence, which is a step further from the data than the evidence itself.
- Book chapter A chapter in a scholarly book rather than a journal paper.
- Type not recorded Our record does not say what kind of publication this is, so it is counted in no source count. That is a gap in our data, not a judgement about the research.