Strength Training for Beginners on Weight Loss Medication

Strength training is one of the most useful things you can add to treatment with Mounjaro (tirzepatide), Wegovy (semaglutide) or another GLP-1 medicine. These medicines can lead to substantial weight loss, and some of that weight is lean tissue, including muscle. Regular resistance exercise, done at least twice a week, helps your body hold on to muscle, keeps you strong and mobile, and supports long-term weight management. You do not need a gym or any previous experience. This guide explains the basics, gives you a simple home routine and a gym option, and shows how to progress safely.

Why strength training matters on GLP-1 medication

Protecting muscle during weight loss

Body composition substudies from the major GLP-1 trials show that lean mass makes up a meaningful share of total weight lost. In the SURMOUNT-1 tirzepatide substudy it was roughly a quarter, and in the STEP 1 semaglutide substudy closer to two-fifths. This is broadly in line with other forms of calorie restriction, but because the overall weight loss can be large, it is worth taking steps to limit it.

Resistance training is the strongest signal you can give your body to keep muscle. When combined with adequate protein, it is the main evidence-based strategy for protecting lean tissue. Our guide to preserving muscle mass on GLP-1 treatment explains the research in more detail.

Other benefits

Strength training also:

• improves the ability to carry out everyday tasks, such as climbing stairs, getting up from the floor and carrying shopping
• supports bone density, which can decline with significant weight loss
• improves blood sugar control, because muscle takes up glucose
• reduces the risk of falls, particularly in older adults
• can improve mood, confidence and sleep
• helps shape the body as fat is lost

How much and how often?

UK guidelines and the 2025 advisory

The UK Chief Medical Officers' Physical Activity Guidelines recommend that all adults do activities that strengthen the major muscle groups on at least two days a week. The 2025 joint advisory on nutritional priorities for GLP-1 therapy, published by four US professional societies, recommended regular strength training at least three times weekly, alongside at least 150 minutes of moderate aerobic activity.

For a beginner, two sessions a week is a realistic and worthwhile starting point. Over time, many people find adding a third session manageable.

Sets, repetitions and effort

General principles for beginners, broadly reflecting guidance from the American College of Sports Medicine on resistance training:

• Repetitions (reps): around 8 to 15 per set.
• Sets: start with 1 set of each exercise, building to 2 or 3.
• Rest: 1 to 2 minutes between sets.
• Effort: the last two or three repetitions of a set should feel challenging, but you should be able to keep good form. If you could easily do many more, the exercise is too easy; if you cannot complete 8 with good form, it is too hard.
• Exercises: 6 to 8 exercises covering legs, hips, back, chest, shoulders, arms and core.
• Recovery: leave at least one day between sessions that work the same muscles.

A simple way to judge effort is a 1 to 10 scale, where 1 is no effort and 10 is maximum. For beginners, aim for around 6 to 7 out of 10 by the end of each set.

Before you start

Check with your GP if needed

Most people can safely start gentle strength exercises, but speak to your GP or prescriber first if you:

• have heart disease, angina or heart failure
• have uncontrolled high blood pressure
• have diabetes and take insulin or a sulphonylurea (because of the risk of low blood sugar)
• have significant joint problems, back pain or a recent injury
• have had recent surgery, including hernia repair
• have osteoporosis or a history of fractures
• are pregnant or have recently given birth

Fuel and fluids

GLP-1 medicines reduce appetite, and exercising on very little food can leave you light-headed or weak. A small snack containing carbohydrate and some protein an hour or two before training, such as yoghurt with fruit, a slice of toast with peanut butter, or a glass of milk, often helps. Sip fluids before, during and after your session. After training, include protein in your next meal or snack. See our guides to protein intake on weight loss injections and hydration on GLP-1 medication.

Plan around your injection and side effects

Some people feel more nauseous or tired in the day or two after their weekly injection. Schedule strength sessions for days when you usually feel better. Leave a gap after meals before training, as vigorous effort on a full stomach can worsen nausea or reflux. Rest if you have vomiting or diarrhoea.

Warm up

Spend five minutes warming up before every session: marching on the spot, gentle arm circles, shoulder rolls, hip circles and easy bodyweight squats to a chair. This raises your heart rate and prepares joints and muscles.

Beginner home routine (no equipment)

This routine needs only a sturdy chair, a wall and a step or bottom stair. Do it twice a week to start. Complete 1 set of each exercise, rest, then repeat for a second set when ready.

If getting down to the floor is difficult, do the glute bridge lying on a bed, or swap it for a standing hip extension holding a chair. Replace bird dog with a seated knee lift if needed.

Adding resistance bands

Once the home routine feels comfortable for two sets of 12 to 15 reps, resistance bands are an inexpensive way to add challenge. They usually come in colour-coded strengths.

Beginner gym routine

If you have access to a gym, machines are a good way to start because they guide your movement. Many gyms offer free inductions; ask a member of staff to show you how to set each machine up. A simple full-body session might include:

1. Leg press
2. Seated row machine
3. Chest press machine
4. Lat pulldown
5. Leg curl or glute machine
6. Shoulder press machine
7. Plank (on knees or full) or a seated abdominal machine

Start with a light weight you can lift for 12 to 15 repetitions with good form. Over time, progress to free weights, such as dumbbells and kettlebells, ideally with guidance from a qualified instructor.

How to progress

Muscles adapt to the demands you place on them. To keep improving, gradually increase the challenge. This is called progressive overload. Change one thing at a time:

A sensible rule is to progress when you can comfortably complete the top of your rep range for all sets with good form on two sessions in a row.

A sample 12-week progression

Technique and safety tips

• Breathe. Breathe out during the effort (for example, as you stand up or push away) and in as you return. Avoid holding your breath, which can spike blood pressure.
• Control the movement. Avoid using momentum. Slow, controlled repetitions are safer and more effective.
• Move within a comfortable range. Some muscle effort and mild soreness the next day are normal. Sharp or joint pain is not.
• Rise slowly. If you have been lying or sitting on the floor, get up gradually. Dizziness and low blood pressure-related events are listed as common in the Mounjaro product information for weight management, and dehydration can make this worse.
• Mind your injection site. It is sensible to avoid heavy pressure on, or vigorous rubbing of, a fresh injection site. Follow your injection technique guidance.
• Wear supportive footwear and train on a non-slip surface.
• Keep a log. Recording exercises, sets, reps and resistance helps you see progress and plan the next step.

Cool-down and recovery

Finish each session with a few minutes of gentle movement, such as walking around or marching slowly on the spot, followed by stretches for the main muscles you worked. Hold each stretch for around 15 to 30 seconds without bouncing. Have a drink and, within a few hours, a meal or snack that includes protein.

Mild muscle soreness a day or two after a new or harder session is normal and usually fades within a few days. It tends to become less noticeable as your body adapts.

Signs you may be doing too much

• you feel exhausted for the rest of the day after a session
• muscle soreness lasts more than three or four days
• you have joint pain, or pain that is sharp rather than a dull ache
• your performance is getting worse rather than better over several weeks
• you feel dizzy or light-headed during or after sessions
• you are struggling to eat enough to support your activity

If you notice these signs, reduce the number of sets, the resistance or the number of sessions for a week or two, and make sure you are eating and drinking enough. If symptoms persist, speak to your GP or a physiotherapist.

Overcoming common barriers

"I feel self-conscious"

Starting at home can build confidence. Women-only gym sessions, small group classes, beginner sessions and exercise referral schemes through GP practices can all provide a supportive environment.

"I don't have time"

Short sessions work. A 15 to 20-minute routine twice a week is enough to begin. You can also split exercises across the day.

"I have joint pain"

Choose exercises that do not aggravate your symptoms. Chair-based exercises, water-based resistance work and machines can be gentler. A physiotherapist can recommend safe exercises and adaptations.

"I'm not seeing results on the scales"

Strength training may slow apparent weight loss slightly because you are preserving muscle, but that is a good thing. Track strength, measurements and how your clothes fit instead. Our guide to measuring progress beyond the scales explains how, and our guide to weight loss plateaus covers what is normal.

Strength training for older adults

Muscle and bone naturally decline with age, making strength training particularly important for older people on GLP-1 treatment. The UK guidelines also recommend balance and flexibility activities at least twice a week for older adults. Tai chi, yoga, Pilates and simple balance exercises (standing on one leg near a support) are useful additions. Supervised classes, such as strength and balance programmes run by local councils or the NHS, are a safe way to start. Our guide to GLP-1 medicines over 65 covers more.

Combining strength with other activity

Strength training works alongside aerobic activity, not instead of it. Walking, cycling and swimming benefit your heart and lungs, mood and blood sugar. Our practical guide to exercise on GLP-1 medication shows how to build a balanced weekly plan.

Finding support

Some NHS weight management services and regulated online providers offer exercise guidance, coaching or apps alongside treatment; others offer little beyond the prescription. If support with physical activity matters to you, it is worth asking before you start. You can compare what different services include on our providers page. For background on the medicines, see our weight loss injections hub.

When to speak to a professional

Speak to your GP, prescriber or a physiotherapist before starting or continuing if you:

• have heart disease, uncontrolled blood pressure, or have had a heart attack or stroke
• have diabetes and take insulin or a sulphonylurea
• have osteoporosis, a history of fractures, or significant joint or back problems
• have a hernia or have had recent abdominal surgery
• notice pain that persists for more than a few days after exercise
• feel increasingly weak or find everyday tasks getting harder

Stop immediately and call 999 if you experience:

• chest pain, pressure or tightness, especially if it spreads to your arm, neck, jaw or back
• severe breathlessness, fainting or collapse
• sudden weakness or numbness on one side of the body, or difficulty speaking

Stop and seek advice from NHS 111 or your GP if you have:

• recurring dizziness or light-headedness
• symptoms of low blood sugar if you have diabetes (shaking, sweating, confusion)
• severe muscle pain with dark, cola-coloured urine after exercise
• severe abdominal pain, with or without vomiting

Decisions about your medication belong to your prescriber. For personalised exercise advice, consider a physiotherapist or a qualified exercise professional.