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 Program For Weight Loss — UK Guide
A structured gym program is one of the most effective ways to support sustainable weight loss in the UK. Combined with healthy eating and lifestyle changes, regular exercise helps build muscle, boost metabolism, and improve overall health. For eligible adults, prescription weight management options like GLP-1 medications are also available through the NHS or private prescribing services. This guide covers gym-based approaches alongside the medical support that may help you reach your goals.
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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.
Combining Exercise With Weight Management Options
A gym program for weight loss works best when combined with a calorie-controlled diet and, where appropriate, prescription support. The NHS recommends at least 150 minutes of moderate-intensity aerobic activity per week, plus strength training twice weekly, for optimal health and weight management benefits.
For eligible UK adults, three prescription-only weight management medications are licensed:
- Mounjaro (tirzepatide) — dual GIP/GLP-1 receptor agonist, once-weekly injection. Clinical trials showed average weight loss of 15–21% body weight alongside lifestyle changes.
- Wegovy (semaglutide) — GLP-1 receptor agonist, once-weekly injection. Average weight loss of approximately 15% body weight in clinical trials.
- Saxenda (liraglutide) — GLP-1 receptor agonist, daily injection. Licensed for weight management in eligible UK adults.
All three require a clinical assessment to determine eligibility. Individuals with a BMI of 30 or above, or BMI of 27–29.9 with weight-related health conditions like type 2 diabetes or high blood pressure, may qualify. Use our free GLP-1 weight loss calculator to explore potential outcomes at different doses.
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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.
NHS vs Private Access — How to Get Started
In the UK, prescription weight loss medication is accessible through two routes. NHS access involves referral to a specialist tier 3 weight management service by your GP — availability varies significantly by region and waiting times can be lengthy. Private access is available through GPhC-registered online prescribing services following a clinical consultation, with no NHS waiting list.
To find out if you're eligible, start by calculating your BMI using our free BMI calculator. Then speak with your GP about your weight management goals. They can discuss whether prescription medication combined with your gym program is appropriate for you, and explain the options available in your area. Prescription medications work alongside exercise and diet, not instead of them — a structured approach gives you the best chance of sustainable success.
- 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.
Can I lose weight with just a gym program without medication?
Yes, absolutely. Regular exercise combined with a balanced, calorie-controlled diet can lead to sustainable weight loss. The NHS recommends 150 minutes of moderate-intensity activity plus strength training weekly. However, for some people, prescription weight loss medication alongside gym work produces better results. Your GP can advise what's best for your situation.
What type of gym workout is best for weight loss?
A combination of aerobic exercise (running, cycling, swimming) and resistance training (weights, bodyweight exercises) is most effective. Aim for 150 minutes of moderate cardio weekly plus two strength sessions. Consistency matters more than intensity — finding a routine you enjoy and can sustain is key.
Am I eligible for prescription weight loss medication in the UK?
You may be eligible if you have a BMI of 30 or above, or BMI of 27–29.9 with weight-related health conditions such as type 2 diabetes, high blood pressure, or sleep apnoea. Ethnicity-adjusted thresholds may apply if you're of South Asian, Chinese, Black African, or Black Caribbean heritage. Speak with your GP for a personal assessment.
How long does it take to see weight loss results from a gym program?
Most people notice changes within 4–6 weeks of consistent exercise and dietary changes, though weight loss may take 8–12 weeks to become significant. The NHS recommends a safe rate of 0.5–1 kg per week. Patience and consistency are more important than rapid results.
What's the difference between Mounjaro and Wegovy for weight loss?
Mounjaro (tirzepatide) is a dual GIP/GLP-1 agonist with average weight loss of 15–21% body weight. Wegovy (semaglutide) is a GLP-1 agonist with average weight loss of around 15%. Both are once-weekly injections. A prescriber will assess which is more suitable for you based on your individual health profile.
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.