HYPE: Regular resistance training improves HbA1c in adults with type 2 diabetes compared with inactive controls.
But what does the evidence actually show?
Regular resistance training lowers HbA1c on average in adults with type 2 diabetes. The effect is modest but useful, and it complements wider diabetes care rather than demonstrating a cure or replacing medication.
The claim
Regular resistance training improves HbA1c in adults with type 2 diabetes compared with inactive controls. The rating below applies to this specific outcome and population, rather than every claim associated with the subject.
Why people believe it
Working muscle uses fuel, and repeated strength training can improve how the body handles glucose. HbA1c reflects longer-term glucose exposure, so it answers a different question from whether a single set produces a smaller post-meal glucose reading. [1] [2]
What the evidence actually shows
An earlier review found a sustained glucose benefit
A 2022 review combined 20 randomised trials involving 1,172 adults with type 2 diabetes. Resistance training reduced HbA1c by an average 0.39 percentage points compared with control. Study results varied, and larger strength improvements were associated with greater HbA1c reductions within the review. That association does not establish that a particular strength gain guarantees a particular glucose change. [1]
A larger recent synthesis agrees on the direction
Michielsen and colleagues' review included 100 randomised trials and 7,195 participants across exercise types. Resistance-training interventions reduced HbA1c by about 0.36 percentage points on average, while combined aerobic and resistance programmes showed broader benefits. These were pooled comparisons across different programmes, not proof that one individual will improve by exactly that amount. [2]
A percentage point is not a percentage reduction
For illustration, moving from an HbA1c of 8.0% to 7.6% is a fall of 0.4 percentage points. It is not a 40% fall and is not a prediction for a particular person. Reporting the units correctly matters when a small-looking number is used in a dramatic headline. [1] [2]
The limitations
Trials differ in starting HbA1c, medication use, supervision, exercise volume and adherence. Blinding people to a training programme is difficult. The average benefit is consistent, but the best programme and expected response remain individual. [1] [2]
These findings concern adults with type 2 diabetes and measured glycaemic outcomes. They cannot establish that strength training alone reverses diabetes, prevents every complication or has the same glucose effect in a healthy person. [1] [2] [3]
What this means for you
Strength training is useful for more than appearance. A programme that is manageable, progressive and suited to your health can be one component of diabetes care. Combining different activity types may offer complementary benefits. [2] [3]
People using medicines that can cause low glucose, or managing complications affecting their feet, eyes, heart or nerves, may need an adapted plan and monitoring. Ask the diabetes team about changes before assuming that a general exercise recommendation is a personal prescription. [3]
Research & Sources
1. Jansson et al. (2022). Effect of resistance training on HbA1c in adults with type 2 diabetes: systematic review and meta-analysis.
Read the original source ↗2. Michielsen et al. (2026; first online 2025). Exercise characteristics, HbA1c and cardiovascular risk factors in type 2 diabetes: systematic review and meta-analysis.
Read the original source ↗3. American Diabetes Association (2016). Physical Activity/Exercise and Diabetes: position statement.
Read the original source ↗Evidence reviewed: October 2026
This targeted editorial review considered evidence available by 25 October 2026. It is not an exhaustive systematic review or independent clinical peer review. Assessment used available full texts, research abstracts and authoritative guidance; some publisher full texts were inaccessible. Evidence vs Hype provides education, not individual diagnosis or treatment. Featured artwork is AI-generated editorial illustration, not a study result or product endorsement.