Wegovy can produce some of the largest medication-driven weight loss ever measured, but not all of what comes off is fat. A share of it can be lean muscle. If you are exercising on Wegovy, protecting that muscle is the difference between results that last and results that rebound. Here is what Wegovy is, how it works, what the trials show, the muscle catch, and how to train around it. This is general information, not medical advice.
What Wegovy is
Wegovy is the brand name for semaglutide at a higher dose (up to 2.4 mg weekly), made by Novo Nordisk. Unlike Ozempic, which is the same drug approved for diabetes, Wegovy is FDA-approved for chronic weight management in adults with obesity, or overweight with a weight-related condition, alongside diet and exercise. It is a once-weekly injection and is prescription-only.
How it works
Semaglutide is a GLP-1 receptor agonist. It imitates the natural gut hormone GLP-1, which is released after eating. It slows gastric emptying so you feel full longer, acts on appetite centers in the brain to reduce hunger, and improves blood-sugar regulation. The net effect is that people eat less without feeling like they are white-knuckling a diet, which drives the weight loss.
The evidence
Wegovy's approval rests on the STEP trial program. In STEP 1, published in the New England Journal of Medicine (2021), once-weekly semaglutide 2.4 mg plus lifestyle intervention produced a mean weight loss of about 14.9 percent over 68 weeks, versus 2.4 percent on placebo, with roughly a third of participants losing 15 percent or more. Common side effects were mainly gastrointestinal, nausea, diarrhea, vomiting and constipation, typically worst during dose escalation.
The muscle catch
Bigger weight loss can mean bigger muscle loss if you do nothing about it. A 2026 meta-analysis in the International Journal of Obesity found roughly 20 to 30 percent of the weight lost on GLP-1 medications can come from lean mass. That matters most on Wegovy precisely because the total loss is so large. Losing muscle lowers resting metabolism and makes regain easier, and weight commonly rebounds after people stop. The countermeasure is consistent: resistance training two to four times a week plus adequate protein (around 1.2 to 2.0 grams per kilogram of body weight daily) preserves muscle and helps your results hold after treatment.
How Cadoo helps
The evidence is clear that strength training preserves muscle; the challenge is doing it every week for many months while appetite is suppressed. Cadoo lets you stake money with friends on hitting your fitness goals, so accountability comes from real stakes and a group chat, not willpower alone. Your phone's camera counts and form-scores bodyweight reps like squats and pushups, so a session only counts when you truly do it, and steps and distance sync from Apple Health and Google Health Connect. Recurring weekly challenges keep you consistent through the stretch when results depend on showing up. Cadoo never alters your medication or its effects and never encourages starting a drug; it simply helps you do the exercise that protects your muscle.
Before you start
Wegovy is prescription-only. Talk to your doctor before starting, stopping or changing any medication or exercise program, and individual results vary. This article is general information, not medical advice. Cadoo is not affiliated with, endorsed by or sponsored by Novo Nordisk or any manufacturer; Wegovy and Ozempic are trademarks of their owners, used here editorially.
Frequently asked questions
Can you exercise on Wegovy?
Yes, and it is strongly encouraged. Resistance training plus adequate protein is the best-supported way to preserve lean muscle during the large weight loss Wegovy can produce. Start gradually, stay hydrated because reduced appetite and nausea are common, and clear any new program with your doctor first.
Does Wegovy cause muscle loss?
It can, and the risk is notable because the total weight loss is large. A 2026 meta-analysis in the International Journal of Obesity found 20 to 30 percent of GLP-1 weight loss can come from lean mass. Strength training and protein protect the muscle you keep.
How much weight do people lose on Wegovy?
In the STEP 1 trial published in the New England Journal of Medicine, semaglutide 2.4 mg plus lifestyle changes produced a mean weight loss of about 14.9 percent over 68 weeks, versus 2.4 percent on placebo. Individual results vary.
What are the best workouts on Wegovy?
Prioritize resistance training two to four times a week across all major muscle groups, plus daily steps and movement. Progressive strength work tells your body to hold onto muscle even in a calorie deficit, protecting your metabolism and long-term results.
