The UK's most complete GLP-1 guide
Every Question Answered. Every Side Effect Explained.
- How GLP-1 medications work
- Mounjaro vs Wegovy compared
- Injection instructions
- Side effects & solutions
- What to eat on treatment
- FAQs answered
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Gym Programmes for Weight Loss — What Works in the UK
Gym programmes are an effective part of weight management in the UK, but exercise alone rarely leads to significant weight loss without dietary changes. The NHS recommends combining regular physical activity with a reduced-calorie diet for sustainable results. Whether you're looking to lose weight or improve your overall health, structured gym programmes can help increase fitness, build muscle, and support your weight loss goals. This guide explains how gym-based exercise contributes to weight management, what types of programmes work best, and how to combine them with other approaches like nutrition planning and, where appropriate, prescription weight loss medication.
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Calculate Your BMI Instantly
Enter your height and weight below. Supports both imperial (stone & lbs) and metric (kg). Results include NHS category, healthy weight range, and ethnicity adjustments.
What Is BMI and Why Does It Matter?
Body Mass Index (BMI) is the most widely used screening tool for assessing whether your weight falls within a healthy range. Used by the NHS, GPs, and weight management services across the UK, BMI provides a quick snapshot of your weight relative to your height. The formula is simple: your weight in kilograms divided by your height in metres squared (kg/m²).
While BMI isn't a perfect measure — it doesn't account for muscle mass, bone density, or fat distribution — it remains the standard first step in identifying potential weight-related health risks including type 2 diabetes, cardiovascular disease, high blood pressure, and certain cancers.
The NHS also recommends adjusted thresholds for people of South Asian, Chinese, or Black African heritage — a BMI of 23 or above is classified as overweight, and 27.5 as obese. Our calculator includes this adjustment as a one-click toggle.
How Exercise Supports Weight Loss
Exercise supports weight loss through several mechanisms. Physical activity burns calories during the workout itself, increases your metabolic rate for hours afterward, and helps preserve muscle mass during weight loss — which is crucial because muscle tissue burns more calories at rest than fat. The NHS recommends adults aim for at least 150 minutes of moderate-intensity aerobic activity per week (such as brisk walking or cycling) plus strength training twice weekly.
For weight management in the UK, the most effective gym programmes combine:
- Cardiovascular exercise — running, cycling, rowing, swimming — to create a calorie deficit
- Resistance training — weightlifting or bodyweight exercises — to maintain muscle and boost metabolism
- Consistency — regular attendance is more important than intensity; sustainable habits beat occasional intense sessions
However, it's important to note that weight loss is approximately 80% diet and 20% exercise. Even with an excellent gym routine, weight loss won't happen without a calorie deficit through nutrition choices. Calculate your personal BMI and healthy weight range using our free BMI calculator above to understand your starting point.
Clinically BackedWeight Loss
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How It Works
Three simple steps to understand your weight and take action.
Enter your height and weight in our free calculator. Get your BMI, NHS category, healthy weight range, and ethnicity-adjusted thresholds instantly.
If your BMI suggests you're overweight or obese, explore our GLP-1 calculators to project potential weight loss on Mounjaro or Wegovy.
Use our progress tracker to log your weight weekly, visualise your journey with charts, and stay motivated — all stored privately in your browser.
Free Weight Loss Tools & Guides
Everything you need to understand your weight, explore medication options, and track your progress — completely free.
Combining Gym Programmes with Other Weight Loss Approaches
For optimal results, combine your gym routine with dietary changes — focus on whole foods, adequate protein, and reducing processed foods and sugary drinks. The NHS also recommends tracking your progress, staying hydrated, and getting adequate sleep, as poor sleep can interfere with weight loss efforts.
For some people, particularly those with a BMI of 27 or above with weight-related health conditions, or a BMI of 30 or above, prescription weight loss medication may be appropriate alongside exercise and diet. Medications such as GLP-1 injections can support appetite management while you focus on building healthy gym habits. If you're considering prescription weight loss options, consult your GP or a licensed prescriber to assess what's suitable for you. Use our GLP-1 weight loss calculator to understand potential outcomes, and our progress tracker to log your fitness and weight changes over time.
- Dual GIP/GLP-1 receptor agonist
- Up to 22.5% body weight loss (SURMOUNT-1)
- Weekly injection, dose escalation over 20+ weeks
- Available via private prescription in the UK
- Doses: 2.5mg → 5mg → 7.5mg → 10mg → 12.5mg → 15mg
- GLP-1 receptor agonist
- Up to 15–17% body weight loss (STEP trials)
- Weekly injection, 5-step dose escalation
- NHS & private prescription available
- Doses: 0.25mg → 0.5mg → 1mg → 1.7mg → 2.4mg
Mounjaro vs Wegovy: Head-to-Head
A side-by-side comparison of the two most popular GLP-1 weight loss medications available in the UK.
| Feature | Mounjaro | Wegovy |
|---|---|---|
| Drug class | Dual GIP/GLP-1 agonist | GLP-1 agonist |
| Active ingredient | Tirzepatide | Semaglutide |
| Avg. weight loss | 15–22.5% | 12–17% |
| Key trial | SURMOUNT-1 (2022) | STEP 1 (2021) |
| Max dose | 15 mg weekly | 2.4 mg weekly |
| Escalation period | 20–32 weeks | 16–20 weeks |
| Administration | Weekly injection (pen) | Weekly injection (pen) |
| NHS availability | Private prescription only | NHS & private |
| Approx. private cost | £150–£250/month | £150–£300/month |
| Common side effects | Nausea, diarrhoea, constipation | Nausea, vomiting, diarrhoea |
Data sourced from SURMOUNT-1 and STEP 1 clinical trials. Costs are approximate and vary by provider. Always consult a prescriber.
Am I Eligible for Weight Loss Medication?
In the UK, eligibility for GLP-1 weight loss medications like Mounjaro and Wegovy is based on your BMI and overall health profile.
- BMI of 30 or above (obese)
- Age 18 or over
- No contraindicated conditions
- Committed to lifestyle changes
- BMI of 27 or above
- Plus type 2 diabetes
- Or high blood pressure
- Or obstructive sleep apnoea
Use our BMI calculator to check whether your BMI falls within the eligible range.
How We Built These Tools
Every calculator and guide on myweightcheck is built with accuracy and transparency in mind. Our BMI calculator uses the standard WHO formula with NHS-aligned category thresholds. Our GLP-1 projections are modelled on published clinical trial data from SURMOUNT and STEP studies.
All data stays on your device. We don't require sign-ups, and we don't store your health information on any server. Your progress tracker saves data locally in your browser using localStorage, so only you can see it.
We're based in the UK and our tools are designed specifically for UK users — supporting stone & lbs by default, referencing NHS guidelines, using NICE-approved medication data, and linking to GPhC-registered pharmacies.
Frequently Asked Questions
Common questions about BMI, weight loss medications, and our free UK tools.
How often should I go to the gym for weight loss?
The NHS recommends at least 150 minutes of moderate-intensity activity per week, which could mean 3–5 gym sessions of 30–50 minutes each. Consistency matters more than intensity — regular moderate exercise beats sporadic intense workouts. Start with what's sustainable for you and build gradually.
Will gym exercise alone help me lose weight?
Exercise alone rarely causes significant weight loss without dietary changes. Weight loss requires a calorie deficit, which is primarily achieved through nutrition. Gym programmes are most effective when combined with a reduced-calorie, balanced diet. They help preserve muscle, boost metabolism, and improve overall health.
What type of gym programme is best for weight loss?
The best programme combines cardiovascular exercise (running, cycling, rowing) with resistance training (weights or bodyweight exercises). Cardiovascular activity burns calories during exercise; resistance training preserves muscle and increases resting metabolic rate. A mix of both, done consistently 3–5 times weekly, is most effective.
Should I do gym exercise if I'm taking weight loss medication?
Yes. Prescription weight loss medications like GLP-1 injections work best alongside exercise and diet, not instead of them. Exercise supports overall health, helps preserve muscle during weight loss, and improves cardiovascular fitness. Discuss your exercise routine with your prescriber if you're on medication.
How long does it take to see weight loss results from gym programmes?
With consistent exercise and dietary changes, most people begin seeing results within 4–6 weeks, though this varies. The NHS recommends aiming for a safe loss of 0.5–1 kg per week. Track your progress using our free progress tracker to monitor changes in weight, measurements, and fitness improvements over time.
Ready to take control of your weight loss journey?
Start with a free BMI check, explore your GLP-1 options, or begin tracking your progress today. No sign-up. No cost. Just results.