GLP-1 Fitness: What Your Coach Needs to Know

Ozempic and Wegovy are both brand names for semaglutide. Mounjaro is tirzepatide, a dual GIP/GLP-1 receptor agonist.

All three are grouped together here as "GLP-1 medications" because that is how most people search for and talk about them, but they are not identical drugs.

These medications slow gastric emptying, increase insulin release when blood glucose is elevated, and influence appetite and fullness signals in the brain. Clinical trials have shown that they can support substantial weight loss, although outcomes vary by medication, dose, health context, and treatment duration (Mozaffarian et al., 2025).

If you started one and have not touched a weight yet, you are not behind. But you may be leaving something important on the table.

A study presented at the Endocrine Society's ENDO 2026 conference tracked Fitbit data from 753 adults with obesity before and after they started a GLP-1 medication (Maharjan et al., 2026).

In this cohort, average daily steps and moderate-to-vigorous activity were lower after participants started GLP-1 treatment. Because this was a retrospective pre/post analysis, it cannot show that the medication caused the change.

This was a retrospective pre/post cohort presented as a conference abstract, not a controlled trial. It cannot prove that the medication caused the change for every individual.

One practical implication is that appetite changes, lower energy or treatment-related symptoms may affect activity for some people. A training plan should respond to the individual's experience rather than assume that weight loss will automatically increase activity.

When you lose weight through medication, dieting, surgery, or another approach, some of what comes off may be lean mass rather than fat alone.

Lean mass means everything in the body that is not fat: muscle, bone, organs, and water. A lean-mass number is not a direct stand-in for skeletal-muscle loss specifically, but preserving lean tissue, strength, and function is still a practical priority.

In a body-composition analysis from the SURMOUNT-1 tirzepatide trial, about 75% of the weight lost was fat mass and about 25% was lean mass over 72 weeks. That is a study average, not a prediction for any one person (Look et al., 2025).

How much lean tissue changes varies with:

• The medication and dose
• Starting body composition
• Age and health status
• The rate of weight loss
• Protein intake and overall nutrition
• Strength training
• Sleep, stress, and recovery
• How body composition is measured

The S-LiTE study in Denmark randomized adults with obesity, after an initial low-calorie diet, to liraglutide alone, supervised exercise alone, both combined, or placebo. Researchers measured physical outcomes including stair-climb performance, cardiorespiratory fitness, and leg strength (Jensen et al., 2026).

In this specific trial, liraglutide alone supported weight loss but did not improve the fitness measures assessed. Participants assigned to structured exercise improved physical fitness measures whether exercise was used alone or alongside liraglutide.

Structured exercise did, whether or not someone was also taking the medication. Compared with liraglutide alone, combined treatment improved stair-climb time by 8.6% and improved peak oxygen consumption. Exercise alone produced similar fitness benefits (Jensen et al., 2026).

This does not mean medication has no role. It means weight loss and fitness are different outcomes, and exercise is what specifically trains fitness.

The same research team followed people for one year after the study medication and supervised exercise both stopped (Jensen et al., 2024).

More people who had trained, with or without the medication, maintained at least 10% of their original body-weight loss one year after treatment ended (Jensen et al., 2024).

Medication and training can contribute to different outcomes. Medication may support weight loss, while exercise directly trains strength, fitness and physical capacity.

Muscle is not just aesthetic.

It supports everyday function, strength, glucose disposal, balance, and physical independence as you age. Muscle contributes to resting energy expenditure, but preserving strength, function and physical capacity is the more practical training priority during weight loss.

The goal is not only to weigh less. It is to protect the strength and capacity that make the result useful in daily life.

That may look like:

• Carrying shopping bags without feeling exhausted
• Walking up stairs with more confidence
• Feeling stable when getting up from the floor
• Having more energy for work, travel, family, or sport
• Keeping the strength needed to stay independent later in life

Resistance training is commonly recommended as part of efforts to preserve strength and lean tissue during weight loss, including during GLP-1 treatment (Jensen et al., 2026; Mozaffarian et al., 2025).

Cardio still matters for heart health, stamina, mood, and blood-glucose management. But it should not displace strength training when energy and recovery are limited. Resistance work provides the direct stimulus that helps protect muscle during substantial weight loss.

For adults generally, WHO recommends 150 to 300 minutes of moderate-intensity aerobic activity per week, or an equivalent amount of vigorous activity, alongside muscle-strengthening activity on two or more days (WHO, 2020).

You do not need to reach that immediately.

The right training volume depends on recovery, appetite, symptoms, training history, and medical context, not a fixed rule.

This is general guidance, not an individual program. Some people should speak with their doctor before starting or changing a training routine, particularly those returning after a long inactive period, living with cardiovascular disease or other significant health conditions, or using insulin or a sulfonylurea alongside a GLP-1 medication.

GLP-1-aware coaching means adapting fitness training around your reported energy, recovery, schedule and medical guidance. It does not include medication management or clinical nutrition prescribing.

• Strength sessions are adjusted around recovery, rather than treated as a failure when energy dips.

• Training volume progresses only when appetite, sleep, symptoms, and recovery allow.
• Your available equipment, gym layout, work demands, travel, and lower-energy days are built into the plan.
• Feedback changes the next session, rather than being collected and ignored.
• Progress is tracked through strength, movement, energy, recovery, and body-composition trends; not only the scale.

Reduced appetite can make it genuinely difficult to meet protein and hydration needs on some days.

As general context, a joint clinical advisory cites protein ranges around 1.2 to 1.6 grams per kilogram of body weight during active GLP-1 treatment (Mozaffarian et al., 2025).

That figure is educational, not a target to follow without individual guidance. That range should not be treated as a personal target. Individual nutrition needs depend on medical history, body size, food tolerance and the wider care plan, and should be set by the appropriate clinical professional. tolerance, and the rest of your care plan.

everybody does not set individual nutrition targets for GLP-1 clients in-house. Those plans are built by outsourced clinical nutritionists working alongside each client's prescribing physician.

Lower energy availability also means more training is not always better. The goal is enough resistance training to support strength and lean tissue, not to create maximum fatigue.

Nausea and gastrointestinal discomfort can be more noticeable early in treatment and during dose increases, although the timing and severity vary greatly from person to person (Mozaffarian et al., 2025).

A coach who understands GLP-1-aware training adjusts session timing, duration, and intensity around that reality instead of treating a missed Tuesday as a discipline problem.

Symptoms that are severe or do not ease over time are worth raising with your prescribing physician, not simply working around.

Pause training and contact your medical team if you experience:

• Fainting
• Chest pain
• Severe or persistent vomiting
• Inability to keep fluids down
• Severe dizziness
• Unusual weakness
• Any symptom that worries you

GLP-1 medications generally have a lower risk of hypoglycaemia when used alone, but combining them with insulin or a sulfonylurea can raise that risk.

If you use either medication alongside a GLP-1, ask your prescribing clinician for an individual plan for exercise, food, medication, and blood-glucose monitoring before changing your routine.

Do not adjust medication doses based on fitness advice, social-media content, or a coaching plan. Medication decisions belong with your prescribing clinician.

Two people can lose the same amount of scale weight while having very different changes in fat mass, lean tissue, strength, energy, and function.

That is why the scale should not be the only measure of progress.

Useful things to track include:

• Strength numbers and repetitions with good technique
• Energy and recovery
• Daily movement
• Waist measurements
• How clothes fit
• Optional progress photos
• Body-composition trends, when measured under comparable conditions

And remember: BMI alone does not tell the full story.

At everybody, GLP-1-aware coaching is not a generic fat-loss plan with fewer calories. Strength training is built into the every shred program and every professional program from the start. It is then adjusted around appetite, energy, recovery, equipment, schedule, and the feedback each client gives.
The goal is not simply to focus on scale weight. It is to support strength, fitness and physical capacity while your medically supervised weight-loss treatment continues.
You can also meet everybody's specialist coaches and review their qualifications, specialties and coaching backgrounds before getting matched.

None of this is a reason to avoid GLP-1 medication, and none of it is medical advice.

GLP-1 medication is not a shortcut, a failure, or a substitute for effort. It is a medical tool that can make weight loss more achievable as part of a plan your own doctor is actively managing.

everybody does not support starting or continuing a GLP-1 medication without a prescribing physician's ongoing supervision. That relationship, and any change to dose or use, stays with your doctor, not your coach.

Nutrition guidance for everybody's GLP-1 clients is built by outsourced clinical nutritionists, not written by your coach or by this blog. The right targets depend on details only your own medical team can assess safely.

What weight loss feels like in your body, and how well you can sustain the life you want after it, is where coaching can make a practical difference.

This article provides general fitness education only and is not medical advice. GLP-1 prescribing, medication changes, clinical nutrition targets, and treatment of side effects must be managed by your prescribing physician and qualified clinical team.