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
Free tracker included with every download this week
Weight Loss Programs For The Gym
If you're looking to lose weight through gym-based programmes, combining structured exercise with proper nutrition is key. The NHS recommends a combination of cardiovascular activity, resistance training, and dietary changes for sustainable weight loss. Many people also find that gym programmes work best when paired with weight management strategies — including lifestyle changes and, where appropriate, prescription support. This guide covers the most effective approaches to weight loss through fitness in the UK.
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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.
Building Your Gym-Based Weight Loss Programme
A successful weight loss programme at the gym combines three core elements: structured exercise, calorie management, and consistency. The NHS recommends losing weight at a rate of 0.5 to 1 kg per week for sustainable results, which typically requires a calorie deficit of around 500 kcal per day.
- Cardiovascular training: 150 minutes of moderate activity weekly (brisk walking, running, cycling) burns significant calories and supports heart health
- Resistance training: 2–3 sessions weekly builds muscle, which increases resting metabolic rate and helps preserve muscle during weight loss
- Calorie tracking: Most people lose weight more effectively when they understand their daily intake — aim for a modest, sustainable deficit rather than extreme restriction
- Recovery and sleep: Adequate rest supports hormone regulation, appetite control, and exercise performance
Your gym programme should also include flexibility work and core strength exercises to prevent injury and improve overall fitness.
Clinically BackedWeight Loss
No appointments. No waiting rooms. Just care — from a UK-regulated online pharmacy.
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.
Weight Management Support — Including Medical Options
For many people, gym programmes alone may not be enough — especially if weight-related health conditions are present. Prescription weight loss medications are now available in the UK through NHS specialist services or private prescribing, including GLP-1 injections like Wegovy and dual GIP/GLP-1 medications like Mounjaro. These medicines work alongside diet and exercise, not instead of them.
Clinical trials show that GLP-1 medications may help reduce appetite and support feeling fuller after smaller meals — meaning your gym efforts are paired with additional metabolic support. Access is through clinical assessment with your GP or a licensed prescriber. You can use our free GLP-1 weight loss calculator to explore potential outcomes, and our BMI calculator helps track where you sit on NHS health guidelines. Weight management in the UK increasingly combines gym-based fitness with evidence-based medical support where clinically appropriate.
- 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 much exercise do I need weekly to lose weight at the gym?
The NHS recommends at least 150 minutes of moderate cardiovascular activity weekly, plus 2–3 sessions of resistance training. Combined with a calorie deficit of around 500 kcal daily, this typically supports a sustainable loss of 0.5–1 kg per week. Consistency matters more than intensity — a sustainable routine you can maintain is more effective than extreme short-term effort.
Can I lose weight through gym exercise alone without changing my diet?
While exercise is beneficial, weight loss requires a calorie deficit — which is difficult to achieve through exercise alone. A 1 kg loss typically requires a deficit of around 7,700 kcal. Most people find combining moderate dietary changes with regular exercise far more effective and sustainable than relying on exercise alone.
What's the difference between resistance training and cardio for weight loss?
Cardiovascular exercise burns calories during activity. Resistance training builds muscle, which increases your resting metabolic rate (calories burned at rest). For optimal results, combine both: cardio for immediate calorie burn and muscle-building for long-term metabolic support. This combination also prevents muscle loss during weight loss.
Should I use weight loss injections if I'm already going to the gym regularly?
Prescription weight loss medications like Wegovy or Mounjaro are designed to work alongside diet and exercise, not replace them. They may help reduce appetite and support feeling fuller — making it easier to maintain your calorie deficit while exercising. Eligibility requires assessment by your GP or a licensed prescriber based on your BMI and health conditions.
How do I track progress with a gym weight loss programme?
Track weight weekly (same time, same scales), but also monitor non-scale progress: how clothes fit, energy levels, gym performance (lifting heavier or doing more reps), and measurements. Our free progress tracker helps log weight changes over time. Remember that muscle weighs more than fat — if you're building strength alongside fat loss, the scales may not reflect your full progress.
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.