You step on the scale and the number goes down. That feels good. But if you've been wondering, "Am I losing fat, or am I losing muscle too?" You're asking the right question.
Losing muscle may slow your metabolism. It may make you feel weak and tired. And it may make it harder to keep the weight off long-term.
The good news: simple strength training may help protect your muscles and keep your body strong. You don't need to spend hours at a gym every week. Just a few key moves done regularly may make a real difference.
This article walks you through why muscle matters, how to get started, and what to keep in mind, especially if you're taking GLP-1 medication like semaglutide or tirzepatide.
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Muscle is not just about looking strong. Your muscles help your body burn energy, even when you're resting.
This is called your resting metabolism. The more muscle you have, the more energy your body uses throughout the day, even when you're sitting or sleeping.
When you lose weight without doing any resistance exercise, your body may lose both fat and muscle. That can lower your resting metabolism.
A lower metabolism may make it easier to regain weight later.
Research shows that combining resistance training with a calorie deficit helps preserve lean muscle during weight loss—so more of what you lose is fat, not muscle.
Strength training sends a signal to your body: "Keep this muscle. I need it."
When you challenge your muscles, even with light weights or your own bodyweight, your body works to maintain and rebuild muscle tissue. This process also burns energy, and the effect can last for hours after your workout is done.
You don't need to lift heavy weights or feel sore to get this benefit.
According to the American College of Sports Medicine, even 2 days of resistance training per week can help maintain muscle mass and support metabolic health.
You don't need equipment. You don't need a gym membership.
These beginner-friendly moves can be done at home, in a small space, in about 20 minutes:
Start with 8–10 repetitions of each. Rest for 30–60 seconds between moves. Repeat the circuit 2 times.
CareBox offers unlimited 24/7 support to help you build healthy habits that last.
You don't need to exercise every day to protect your muscle. Most experts recommend at least 2 days of strength training per week.
The CDC recommends that adults do muscle-strengthening activities at least 2 days a week, targeting all major muscle groups.
For most people just getting started, 2–3 sessions per week of 20–30 minutes is plenty for many people.
Consistency matters more than intensity. Showing up twice a week for 3 months beats doing an intense week and then stopping.
A few tips to stay consistent:
GLP-1 medications like semaglutide and tirzepatide help reduce appetite.
That's helpful for weight loss. But it also means you may be eating less protein and fewer calories overall.
When calories drop significantly, your body is more likely to use muscle for energy. This is called muscle breakdown.
A 2023 study in Diabetes, Obesity and Metabolism found that patients on semaglutide lost a meaningful portion of lean mass along with fat. Resistance training may help offset this.
That's why strength training is especially important if you're on a GLP-1.
Along with strength training, pay attention to protein. Getting enough protein each day may help your muscles stay strong.
Most adults benefit from at least 0.7–1 gram of protein per pound of body weight per day during active weight loss, but this can vary by individual. Talk to a licensed healthcare provider or Registered Dietician about the right amount for you.
A few simple ways to get more protein:
Here's the truth: most people don't like working out at first. That's normal. Your body is adjusting.
The goal isn't to love it right away. The goal is to make it easy enough that you actually do it.
Try these habit-building tips:
Results vary for everyone. But many patients find that once they start feeling stronger, it becomes easier to keep going.
CareBox offers more than medication.
Every customer gets unlimited, one-on-one support from Care Coaches as well as access to Registered Dieticians.
Our Registered Dieticians can help you figure out how much protein to eat, what to watch for on a GLP-1, and how to support your body while losing weight.
Your Care Coach guides you through the process, from your first dose to your long-term habits.
Before you start any new exercise routine, it's a good idea to check in with your licensed healthcare provider.
Also reach out if you notice:
Your licensed healthcare provider can help you adjust your plan.
For full safety details about GLP-1 medications, see the Important Safety Information page.
If you're curious about starting a strength routine while on a GLP-1, here are some good questions to bring up to your provider:
Start your journey with a care team that supports you every step of the way.
Losing weight is great. Maintaining muscle while you lose it is even better.
Simple strength training just 2–3 times a week can help protect your metabolism and help your body stay strong.
You don't need a gym. You don't need to be an athlete. You just need to show up a few times a week with some basic moves and a little consistency.
Important Safety Information
CareBox connects customers with licensed providers who may prescribe medication through state-licensed pharmacies. Prescription medication is only available if prescribed after an online consultation, as applicable, with a healthcare provider. Physicians may prescribe compounded medications as needed to meet medical necessity or drug shortages. The FDA does not review or approve any compounded medications for safety or effectiveness. Results may vary. Please review the Important Safety Information.
