GLP-1 Workouts: What to Do on Mounjaro (October 2026)

01 · The core answer

Can you work out on a GLP-1?

Yes. Exercise is part of the licensed use of Mounjaro, which is prescribed alongside a reduced-calorie diet and increased physical activity.¹ In the SURMOUNT-1 trial, people taking tirzepatide did so alongside diet and exercise, and treatment works alongside a reduced-calorie diet and increased physical activity, not instead of them.² Individual results vary.

The practical question is not whether to train but how. Appetite falls, so you eat less, and a lower intake changes how training feels. A routine that suits this phase is built on three things: resistance work, moderate cardio and plenty of ordinary movement.

02 · What to do

A simple weekly structure

Aim to do resistance work on most weeks' training days, in short sessions you can repeat consistently. Consistency beats intensity, especially in the early weeks.

03 · Your next step

What to do next

If you are already prescribed a GLP-1, start gently and build up. If you are still deciding on treatment, our weight loss clinic explains how a free online consultation works, and you can see current options for the Mounjaro pen there.

Related guides: Which GLP-1 is Best for Weight Loss - Lowest UK Prices and Glp 1 adoption.

04 · Strength training

Strength training on Mounjaro

Resistance exercise two or more times a week is worth prioritising while on a GLP-1. Some of any rapid weight loss comes from lean tissue, and protecting muscle protects your metabolism and strength.

Choose compound movements that use several joints at once: squats or sit-to-stands, hip hinges, rows, presses and carries. Bodyweight, bands and dumbbells are enough. A beginner does not need a gym; a few well-chosen exercises, done with good form and gradually made harder, will do more than an ambitious plan you abandon.

Keep sessions short while you are on the lower doses and your appetite is changing. Stop a set if you feel dizzy or unusually weak, and eat before trying again. If you faint, get medical help straight away. Our related guide on exercising on a GLP-1 goes into more detail on building routines.

05 · Cardio and low impact

Cardio and low-impact movement

Moderate cardio, such as brisk walking, is a sensible part of regular activity on a GLP-1. Think brisk walking, cycling or swimming at a pace where you could still hold a conversation. Daily walking is the easiest habit to keep and carries the lowest risk of overdoing it.

Low-impact options are kind to the joints as your weight changes. Gentle yoga, mobility work and stretching also help on the days when injection side effects leave you flat. Mild nausea, altered appetite and tiredness in the first days after each injection are the commonest early effects and usually settle.¹³

06 · Fuelling your workouts

How to fuel workouts on a GLP-1

Fuel training with small, protein-led meals you can tolerate, because appetite is lower and the medicine slows how quickly the stomach empties.¹ If you are training while eating much less than usual, protein and activity are the two things worth protecting.

Practical habits that tend to help:

• Plan protein into every meal, even when you are not hungry. Lean meat, fish, eggs, beans and dairy all work, and our page on Greek yoghurt on Mounjaro shows one easy option.
• Eat something light and easy to digest before training rather than a large meal, which may sit heavily on a slower-emptying stomach.
• Eat again after a session even if appetite is low, so recovery is not left to chance.
• Sip fluids through the day, particularly if nausea or reduced eating is making you drink less.
• Avoid training hard on an empty stomach if you feel light-headed.

If nausea, vomiting or poor appetite is making it difficult to eat enough to train, tell your prescriber rather than pushing through.

07 · Around injection day

Timing workouts around injection day

You can train on any day, but many people notice side effects in the days after each dose. Mild nausea, altered appetite and tiredness are the commonest early effects and usually settle.¹³ Plan lighter sessions for those days and your harder sessions for when you feel best.

There is no best time of day to inject. Mounjaro works the same morning or evening, with or without food, and what matters is the same day each week.¹ Many people choose a weekend morning so early side effects fall on days off, which also keeps training days free of them.

If you change your injection day, you must leave at least 3 days (72 hours) since your last dose.¹ If you miss a dose, take it as soon as you can within 4 days (96 hours) of the scheduled time; if more than 4 days have passed, skip it and take the next one on your normal day — never take two doses within 3 days of each other.

08 · Doses and plateaus

Dose steps and plateaus

Everyone starts on 2.5mg once a week, and this starting dose is about letting your body adjust, not about weight loss itself.¹ Treat those weeks as a time to build the habit of training, not to push hard. Each step up the dose ladder may change your appetite and energy again, so scale sessions to match.

Weight loss on Mounjaro is not linear, and plateaus of a few weeks are normal as the body adapts to a lower weight. Within the licence, the responses are to review food intake honestly, protect protein and activity, check the basics such as sleep and alcohol, and discuss with your prescriber whether a dose step-up is appropriate. A plateau is not a reason to double doses or add unlicensed products.

Trials measured results at 72 weeks, so think in months, not days, and judge progress by trend rather than individual weigh-ins.² Strength, stamina and how your clothes fit are useful measures alongside the scales.

09 · Health conditions

When to check with a professional first

Speak to your prescriber or GP before starting a new training programme if you have a heart, joint or other long-term health condition.

If you take insulin or a sulfonylurea, doses may need adjusting because of the risk of low blood sugar, and exercise can add to that risk. Do not change those medicines yourself; ask your prescriber or diabetes team. Mounjaro is licensed for weight management and for type 2 diabetes. If you have diabetes, tell your prescriber and your usual diabetes team so care stays joined up.¹

Report any new or worrying symptom to your prescriber, and you can report suspected side effects through the Yellow Card scheme.¹⁹

10 · Staying on treatment

Building habits that last

The habits you build while on treatment are the ones most likely to matter afterwards. After a final dose, tirzepatide takes roughly four to five weeks to clear the system, and nothing needs doing while it clears.¹ Whether and when to stop is a decision to take with your prescriber, who reviews your response over time.

Training for strength, eating enough protein and moving daily are the parts of the plan that stay with you. The technology behind GLP-1 medicines explains how they work.

11 · Serious side effects

Serious side effects: when to get help straight away

Serious side effects are uncommon but need urgent attention. Seek immediate medical help for: severe, persistent stomach pain that may spread to your back, with or without vomiting (possible pancreatitis); pain in the upper right abdomen, fever or yellowing of skin/eyes (possible gallbladder problems); or signs of a severe allergic reaction such as swelling of the face or throat and difficulty breathing. If you take insulin or a sulfonylurea alongside Mounjaro, watch for low blood sugar (shakiness, sweating, confusion) — your prescriber may need to adjust those medicines.¹