ARTICLES · M2 PRODESIGN · LONG BEACH, CA
Lift, Eat Protein, Measure Strength: The Three Habits That Matter More on a GLP-1
Clients are walking in on GLP-1 medicines now. Some are already on them. Some will ask you what you think.
Your job is not the prescription. Your job is the work the label already names.
I've been coaching since 1988. I'm the Creator of NESTA's Physique and Figure Training Specialist course, and that nutrition material now lives inside M2 NextGen Fitness Pro. I help trainers build careers. This is one of the skills that will separate the experts from the people repeating whatever they heard online.
Stay in your lane
Trainers do not prescribe these drugs. We don't tell a client to start, stop, delay, or change a dose. We don't source them, and we don't get involved with compounded or research peptides.
If a client has persistent nausea, vomiting, or diarrhea, signs of dehydration, dizziness, fainting, or severe abdominal pain, that's a same-day referral back to their prescriber. Individual protein and calorie targets, very low intake, kidney disease, or a suspected deficiency belong with a registered dietitian. Signs of an eating disorder belong with specialized care.
We lead the habits. The prescriber owns the medicine.
The FDA labels for Wegovy and Zepbound say the drugs are meant to be used together with a reduced-calorie diet and more physical activity. That's your side of the work.
First habit: lift
Any large, fast weight loss costs some lean tissue. That is not unique to these drugs, and it is not a reason to tell clients the medicine eats muscle.
In the SURMOUNT-1 body-composition substudy, after 72 weeks, about a quarter of the weight people lost on tirzepatide was lean mass, not fat. In the semaglutide STEP 1 trial, about 38% of the weight lost in the body-scan group over 68 weeks was lean body mass. Lean mass is not the same thing as muscle. It also includes water, organs, and bone.
What changes the share is training. A 2026 review of 20 trials found that people who added resistance training to lifestyle change lost the smallest share of lean mass, 17.5%.
A 2025 advisory from four obesity and nutrition organizations says GLP-1 treatment should come with strength training at least three times a week, plus at least 150 minutes of moderate aerobic exercise. Cardio alone does less to protect lean mass. If your whole plan is more steps and more classes, you're using the weaker tool.
In a Danish trial of liraglutide, a GLP-1 medicine, the drug alone did not improve fitness. Adding exercise improved stair-climb time and aerobic fitness. That same trial found exercise plus the drug protected hip and spine bone density, while the drug alone lost more bone than exercise alone.
Lead with progressive strength training, fitted to the person in front of you. That's the trainer's job.
Second habit: eat protein
Appetite drops. Portions shrink. Every bite has more work to do.
The same 2025 advisory warns that eating more protein alone is likely not enough to protect muscle without strength training. So don't hand someone a protein number and skip the lifting.
You can share published ranges as education. That advisory proposes 1.2 to 1.6 grams of protein per kilogram a day during active weight reduction, or 80 to 120 grams a day. Then you refer to a dietitian for the individual target, especially if the client has kidney disease or another condition that changes protein needs. You are teaching the use and role of food. You are not writing a medical diet.
Third habit: measure strength
If you only watch the scale, you can miss what the client is actually losing.
Track the load they lift. Track function they can feel, like a sit-to-stand or a stair climb. Track the waist. Use body composition when you have a good tool and you know its limits. The scale still matters. It just isn't the whole story.
I've said for years that the scale can lie about progress. On a GLP-1, that warning gets louder, not quieter.
What to tell a client, in plain words
The medicine turns down the appetite. It does not build the muscle.
If you and your doctor choose a GLP-1, the habits are what make it work and what protect your results. That is true if they stay on the medicine, and it is true if they stop.
In that same Danish trial, people who exercised while they were on the drug were far more likely to keep off at least 10% of their weight a year after all treatment ended than people who took the drug alone.
You don't need to make the medicine the enemy, and you don't need to make it the hero. You need to coach the work.
There's no free lunch
I'll be straight with you. If you want a script that lets you sound like a doctor, or a way to jump into the peptide conversation, this isn't that. If you want to be the coach who knows what to do when a client is losing weight fast, and who knows when to refer out, keep your foot on the gas.
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Our content is educational and isn't medical advice.
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Emile Jarreau, "Mr. Fat Loss." Expert, not influencer. Founder, M2 ProDesign and M2 NextGen Fitness Pro. Creator of NESTA's Physique and Figure Training Specialist course.
M2 ProDesign coaches in person at Trinity Training Facility, 501 Pine Avenue, Long Beach, CA 90802, and online.