One of the most common questions I get from patients starting GLP-1 therapy with Tirzepatide (Mounjaro/Zepbound) or Semaglutide (Ozempic/Wegovy) is: “What type of exercise should I be doing while on GLP-1 medication?”
The short answer: strength and resistance training should be your first priority. Here’s why — and how to structure your routine for the best results.
Understanding the Main Types of Exercise
Before making a recommendation, it helps to understand how the four main categories of exercise work and what each one does for your body.
Aerobic Exercise
Aerobic exercise — also called cardio — includes walking, jogging, hiking, swimming, and cycling. These activities use oxygen to fuel your muscles, elevate your heart rate, and improve breathing over a sustained period.
Benefits of aerobic exercise:
- Improves cardiovascular fitness and heart health
- Lowers blood pressure
- Boosts energy levels
- Burns calories effectively during the activity
Aerobic exercise is generally lower in intensity and longer in duration than anaerobic exercise, and is commonly associated with calorie burning and weight loss.
Anaerobic (Strength & Resistance) Exercise
Anaerobic exercise — including weightlifting, sprinting, HIIT, jumping, and plyometrics — uses energy stored directly in muscles rather than relying on oxygen.
Benefits of anaerobic exercise:
- Increases muscle mass and strength
- Improves insulin sensitivity (something GLP-1 medications like Semaglutide and Tirzepatide also support)
- Decreases risk of osteoporosis
- Prevents cardiac aging
- Lowers cardiovascular risk
- Increases metabolism and resting metabolic rate
Flexibility & Balance Exercise
Flexibility exercises (yoga, stretching) and balance training (tai chi, single-leg work) round out a complete fitness routine. While critical for injury prevention and functional fitness, they are less central to the weight loss goals most GLP-1 patients are working toward.
What Exercise Is Best for Weight Loss and Weight Maintenance?
Exercise is important for weight loss — and even more important for long-term weight maintenance — but the effects of exercise alone on weight loss are modest compared to diet. The most important driver of weight loss is maintaining a caloric deficit over time.
For most patients, a daily deficit of 500–750 calories is the recommended range, producing a healthy, sustainable weight loss of approximately 1.5–2 lbs per week — the target I set for my patients.
This is exactly where GLP-1 medications like Tirzepatide and Semaglutide shine. By suppressing appetite and reducing portion sizes, they make it far easier to consistently run that caloric deficit. Combined with metabolic benefits, your body turns to existing fat reserves for energy — and the weight comes off.
What Exercise Does Dr. Quiros Recommend for Patients on GLP-1 Therapy?
My recommendation: prioritize strength and resistance training. Specifically, I recommend 30–45 minutes per day, 3–4 days per week as a starting baseline.
If you enjoy aerobic exercise, absolutely keep it in your routine — but treat it as secondary to strength training while you are on Semaglutide or Tirzepatide. Here’s why:
1. Optimize Your Body Composition
The caloric deficit produced by GLP-1 medications is more than enough to drive significant weight loss. The question isn’t whether you’ll lose weight — it’s how you lose it.
When you lose weight rapidly without resistance training, your body can break down muscle along with fat. By incorporating strength training, you signal to your body to preserve existing muscle mass and, ideally, build more. This protects your lean mass, increases your fat-burning rate, and leads to a healthier body composition overall.
2. Protect and Increase Your Metabolism
Prolonged caloric deficits can slow your metabolism as your body adapts to using less energy — one of the key reasons patients hit a weight loss plateau. Regular strength and resistance training counteracts this by building muscle, which is metabolically active tissue. More muscle = higher resting metabolic rate = continued fat burning even at rest.
3. Reduce Your Risk of Osteoporosis
Clinical trials for both Semaglutide and Tirzepatide identified bone density loss as a potential side effect. This is especially relevant for women over 65 and postmenopausal patients. Some degree of bone density loss naturally accompanies weight loss — as your skeleton is no longer bearing as much load — but excessive loss can become clinically significant.
Resistance training directly counteracts this by placing mechanical stress on bones, which stimulates bone formation and helps prevent bone loss. Put simply: lifting weights builds stronger bones, not just stronger muscles.
Summary: Aerobic vs. Anaerobic Exercise on GLP-1 Therapy
| Aerobic (Cardio) | Anaerobic (Strength Training) | |
|---|---|---|
| Examples | Walking, cycling, swimming | Weightlifting, HIIT, plyometrics |
| Calorie burn | High during activity | Elevated long after activity |
| Muscle preservation | Low | High |
| Bone density | Moderate benefit | Strong benefit |
| Metabolic impact | Moderate | High |
| Priority on GLP-1 | Secondary | Primary |
Frequently Asked Questions
Can I do cardio while on GLP-1 medication?
Yes — cardio is healthy and beneficial. Just make it secondary to strength training, not the other way around.
How soon after starting GLP-1 therapy should I begin exercising?
As soon as you feel ready. Start with lighter resistance and shorter sessions if needed, and build gradually over the first few weeks.
Will I lose muscle on GLP-1 medications?
You can, if you’re not doing resistance training. That’s exactly why it’s the centerpiece of my exercise recommendation for GLP-1 patients.
This post was prepared by:
Dr. Mario I. Quiros
Good Hearts Health — Owner and Founder
Diplomate of the American Board of Obesity Medicine
Further Reading
- Aerobic vs. Anaerobic Exercise: What’s the Difference? — Shape
- Aerobic vs. Anaerobic Exercise — Healthline
- NEJM: Semaglutide Clinical Trial
Ready to Start a Physician-Supervised GLP-1 Weight Loss Program?
At Good Hearts Health, Dr. Mario Quiros provides personalized, board-certified concierge weight loss care using FDA-approved Semaglutide and Tirzepatide therapy. If you are considering GLP-1 therapy for weight loss, we offer a free initial consultation to see if our program is right for you.