Evidence library

Do you need to exercise on a GLP-1?

Of everything you can add to a GLP-1, structured exercise has the strongest case. Here is what the evidence says about why, what kind, and how much, plus where it is proven versus extrapolated.

How to read these grades

Evidence strength

  • Strong evidence (does / reduces / improves)
  • Moderate evidence (probably / likely)
  • Early / weak evidence (may / might)

Tested in GLP-1 users?

  • Tested in GLP-1 users
  • Not tested in GLP-1 users
  • Trial underway

Exercise is the single most reliable way to protect both muscle and bone

Strong evidence Mixed / consensus

Structured exercise, especially strength training, is the most reliable way to hold onto muscle and bone while losing weight, and the only reliable builder of bone. The evidence base is strong, though the direct GLP-1 data is one liraglutide trial and the rest is extrapolated.

What it rests on

  • Jensen 2024 1

    A randomized trial compared exercise alone, the GLP-1 liraglutide alone, and the two combined after weight loss. The drug-alone group lost bone at the hip and spine, while the group that added exercise kept bone density level with placebo despite losing the most weight.

    Liraglutide 3.0 mg

  • Eglseer 2023 2

    A pooled analysis of many diet and exercise trials in adults near retirement age. Resistance or combined training held onto more lean mass than dieting alone or aerobic exercise alone.

    Dieters and older adults, not GLP-1

  • Sardeli 2018 3

    A pooled analysis of trials in older adults cutting calories to lose weight. Adding resistance training largely prevented the muscle loss that dieting on its own produced.

    Caloric restriction, not GLP-1

Resistance training beats cardio alone for keeping muscle

Moderate evidence Not tested in GLP-1 users

Resistance training, or resistance combined with cardio, probably preserves muscle during weight loss better than cardio alone. This comes from meta-analyses in dieters, not yet from GLP-1 users, and it does not mean cardio is worthless, just weaker for holding muscle.

What it rests on

  • Eglseer 2023 2

    A pooled analysis of many diet and exercise trials in adults near retirement age. Resistance or combined training held onto more lean mass than dieting alone or aerobic exercise alone.

    Dieters and older adults, not GLP-1

  • Sardeli 2018 3

    A pooled analysis of trials in older adults cutting calories to lose weight. Adding resistance training largely prevented the muscle loss that dieting on its own produced.

    Caloric restriction, not GLP-1

The drug plus exercise does more than either one alone

Moderate evidence Tested in GLP-1 users

Combining a GLP-1 with structured exercise probably delivers benefits neither reaches alone: preserved bone, more loss of abdominal fat, and lower inflammation. The evidence is one liraglutide trial reported across two papers, using surrogate measures.

What it rests on

  • Jensen 2024 1

    A randomized trial compared exercise alone, the GLP-1 liraglutide alone, and the two combined after weight loss. The drug-alone group lost bone at the hip and spine, while the group that added exercise kept bone density level with placebo despite losing the most weight.

    Liraglutide 3.0 mg

  • Sandsdal 2023 4

    A report from the same trial as Jensen 2024, looking at fat and inflammation. Combining exercise with the drug cut abdominal fat about twice as much as either alone, and was the only group to significantly lower an inflammation marker.

    Liraglutide 3.0 mg (same trial as Jensen 2024)

The standard prescription: strength training plus about 150 minutes of cardio a week

Expert consensus Mixed / consensus

Clinical consensus is to pair every GLP-1 with regular strength training (three or more times a week) plus at least 150 minutes a week of moderate cardio, tailored to the person. These are recommended targets, not trial-proven exact doses.

What it rests on

  • Mozaffarian 2025 advisory 5

    A joint advisory from four medical societies summarizing current best practice for supporting people on GLP-1s. It is an expert consensus document, not a trial, and is the standard reference for what the field recommends and where evidence is still missing.

    Four-society expert consensus

Sources

  1. 1. Jensen SBK, Sørensen V, Sandsdal RM, et al. Bone Health After Exercise Alone, GLP-1 Receptor Agonist Treatment, or Combination Treatment. JAMA Netw Open. 2024;7(6):e2416775. doi:10.1001/jamanetworkopen.2024.16775
  2. 2. Eglseer D, Traxler M, Embacher S, et al. Nutrition and Exercise Interventions to Improve Body Composition for Persons with Overweight or Obesity Near Retirement Age: A Systematic Review and Network Meta-Analysis of Randomized Controlled Trials. Advances in Nutrition. 2023;14(3):516-538. doi:10.1016/j.advnut.2023.04.001
  3. 3. Sardeli AV, Komatsu TR, Mori MA, Gáspari AF, Chacon-Mikahil MPT. Resistance Training Prevents Muscle Loss Induced by Caloric Restriction in Obese Elderly Individuals: A Systematic Review and Meta-Analysis. Nutrients. 2018;10(4):423. doi:10.3390/nu10040423
  4. 4. Sandsdal RM, Juhl CR, Jensen SBK, et al. Combination of exercise and GLP-1 receptor agonist treatment reduces severity of metabolic syndrome, abdominal obesity, and inflammation: a randomized controlled trial. Cardiovasc Diabetol. 2023;22(1). doi:10.1186/s12933-023-01765-z
  5. 5. Mozaffarian D, Agarwal M, Aggarwal M, et al. Nutritional priorities to support GLP-1 therapy for obesity: a joint Advisory from the American College of Lifestyle Medicine, the American Society for Nutrition, the Obesity Medicine Association, and The Obesity Society. The American Journal of Clinical Nutrition. 2025;122(1):344-367. doi:10.1016/j.ajcnut.2025.04.023