Exercise for Insulin Resistance in Overweight Kids: What Ranks Best

For an overweight child or adolescent with insulin resistance, the best current evidence favors exercise programs that combine high-intensity intervals with resistance training—or aerobic and resistance work performed together—over aerobic exercise alone. The finding comes with an asterisk the size of a kettlebell: the certainty of the modality rankings is low to moderate, and researchers have not yet separated the effects of exercise type from exercise intensity cleanly.

Still, the message is more useful than the usual "move more" advice. Exercise lowered fasting insulin and HOMA-IR, a calculated marker of insulin resistance, across trials in youth with excess weight. The available evidence also suggests that program design and weekly training volume affect the result.

Combined training led the current ranking

In a 2023 JAMA Pediatrics network meta-analysis by García-Hermoso et al., researchers analyzed 55 exercise studies involving 3,051 children and adolescents with excess weight. Participants had a mean age of 13.5 years. Compared with inactive control groups, exercise overall reduced fasting insulin by 4.38 μU/mL (95% CI, −5.94 to −2.82) and HOMA-IR by 0.87 units (95% CI, −1.20 to −0.53).

Those confidence intervals exclude no difference, so the pooled results were statistically significant. They measure biomarkers, however—not future diabetes diagnoses, cardiovascular events, or long-term health. A lower HOMA-IR is encouraging, but it does not prove that a particular workout prevents type 2 diabetes.

The network analysis used SUCRA probabilities to compare exercise formats that had not always been tested directly against each other. Combined HIIT plus resistance training and concurrent aerobic-plus-resistance training ranked highest for both fasting insulin and HOMA-IR. Aerobic-only programs ranked below those combined approaches. The published summary does not provide enough detail to responsibly quote exact SUCRA scores or every head-to-head difference.

The evidence supports a combined program as the leading current option, not as a settled winner for every child.

A network meta-analysis can produce useful comparisons across many trials, but its rankings depend on the trials being similar enough in their participants, interventions, and outcome measurement for indirect comparisons to hold. García-Hermoso et al. rated the certainty of the evidence low to moderate. That is a reason to use the ranking as a guide, not a law of nature.

Training volume may set a floor

The same analysis reported a nonlinear dose-response pattern for fasting insulin and HOMA-IR. Benefits became more reliable at roughly 900 to 1,200 MET-minutes per week, especially among participants who already had insulin resistance at baseline. MET-minutes combine intensity and duration, so they cannot be converted into a universal number of workouts without knowing the activity and its intensity.

This finding makes practical sense without turning it into a rigid target. A program that is too brief or too easy may not deliver enough training stimulus to change insulin-resistance markers. At the same time, the precise threshold needs confirmation before clinicians treat it as a universal prescription. The analysis did not establish one ideal schedule for every age, pubertal stage, fitness level, or family situation.

Why might a mixed program help?

The pediatric trials establish an outcome pattern; they do not prove a mechanism. Adult research offers a plausible explanation. A 2024 systematic review and meta-analysis in sedentary adults found that combined aerobic and resistance training improved glucose metabolism and reduced inflammatory biomarkers beyond single-modality training. Aerobic work and resistance work place different demands on the body, so combining them could produce complementary adaptations.

That explanation remains indirect for adolescents. Researchers have not established, in the studies discussed here, that a particular youth program lowers HOMA-IR through a measured change in muscle glucose transport, myokines, or muscle mass. Biology can explain a finding; it cannot substitute for testing it.

Evidence from youth does support the relevance of high-intensity exercise. In a 2025 randomized study of 33 overweight or obese adolescent girls, participants were assigned to HIIT or control for nine weeks. The HIIT group trained three times weekly without calorie restriction and improved liver enzymes and biomarkers related to metabolic dysfunction-associated steatotic liver disease. That trial supports HIIT as an active component of a program, but it did not test HIIT plus resistance training against HIIT alone.

Do not mistake "aerobic" for "ineffective"

The main challenge to a simple modality hierarchy comes from intensity. A 2026 systematic review and meta-regression by Liang et al. compared sprint interval training with moderate-intensity continuous training in adults with metabolic dysfunction. Sprint intervals produced comparable metabolic benefits with less time, and the meta-regression found no clear dose-dependent difference in those outcomes.

This does not overturn the pediatric network analysis. It studied adults, not children with excess weight, and compared two aerobic formats rather than combined training against single-modality training. It does expose a real uncertainty: if aerobic-only programs in the pediatric literature were often moderate intensity while combined programs included HIIT, intensity could explain part of the apparent advantage. Researchers need direct youth trials that match training intensity and volume while comparing high-intensity aerobic exercise with combined HIIT-plus-resistance programs.

Other evidence supports exercise, with narrower claims

Adult evidence points in the same general direction without confirming a pediatric prescription. A 2022 network meta-analysis in adults with prediabetes also ranked combined exercise approaches above single modalities for glycemic control and insulin resistance. Adults with prediabetes and adolescents with excess weight differ in physiology and disease stage, so this supports plausibility rather than proving that the same ranking or dose applies to children.

Broader adolescent programs can improve cardiometabolic markers as well. In a 2023 study of 22 adolescents with obesity, one year of interdisciplinary care that included nutritional, psychological, and exercise counseling improved inflammatory mediators and cardiovascular-risk markers. Because the program included several components and had no exercise-modality comparison, it cannot tell us which training style drove the changes.

Baseline health may also affect what a child can do at the outset. A 2021 cross-sectional study found that fibrinogen and leptin concentrations predicted cardiorespiratory fitness in children with obesity and diabetes risk. The study identifies an association, not a cause, but it reinforces the need to start where the child is rather than prescribing a punishing template.

What to prescribe from this evidence

For insulin-resistant youth with excess weight, a combined program that includes high-intensity aerobic intervals and resistance training has the best current evidence for reducing fasting insulin and HOMA-IR. The reported 900 to 1,200 MET-minute weekly range is a reasonable evidence-based reference point, particularly when insulin resistance is already present, but it is not a one-size-fits-all command.

Aerobic exercise remains useful, especially when it is the activity a child will actually do consistently. The evidence does not justify calling it the worst choice. It does justify moving beyond low-to-moderate-intensity aerobic exercise alone when an individualized, age-appropriate combined program is feasible. A pediatric clinician or qualified exercise professional should tailor the starting workload, progression, and resistance exercises to the child's health, skills, and access to equipment.

The next decisive studies will compare high-intensity aerobic-only and combined programs directly, at matched intensity and volume, with enough follow-up to show whether improvements in insulin-resistance markers persist. Until then, combined HIIT and resistance training is the leading estimate—not the final answer.