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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Best Gym Program for Weight Loss in the UK
Finding the best gym program for weight loss depends on your personal fitness level, preferences, and health goals. While regular exercise is essential for sustainable weight management in the UK, research shows that combining gym activity with dietary changes and, for some people, prescription weight loss medication produces the most effective results. This guide explores evidence-based gym approaches, how they fit into a wider weight management strategy, and the prescription options available to eligible UK adults.
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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.
Effective Gym Programmes and Weight Management in the UK
The most effective gym programmes for weight loss combine cardiovascular exercise and resistance training. NHS guidance recommends at least 150 minutes of moderate-intensity aerobic activity per week, plus muscle-strengthening activities twice weekly. Resistance training is particularly valuable because muscle tissue burns more calories at rest, boosting your overall metabolic rate.
- Cardiovascular training: Running, cycling, swimming, or gym classes like spin or aerobics
- Resistance work: Weight training, bodyweight exercises, or resistance bands
- High-intensity interval training (HIIT): Short bursts of intense effort followed by recovery — particularly effective for time-constrained exercisers
For sustainable weight loss UK guidelines suggest losing 0.5–1 kg per week. This typically requires a calorie deficit of around 500 kcal daily, achieved through a combination of reduced calorie intake and increased physical activity. Many people find that joining a structured gym programme provides accountability, access to qualified instructors, and a supportive community — all factors that improve adherence to exercise routines.
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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 Exercise with Prescription Weight Loss Options
For eligible UK adults, combining a gym programme with prescription weight loss medication can enhance results significantly. GLP-1 medications like Mounjaro and Wegovy help reduce appetite and support feeling fuller after smaller meals, making it easier to maintain the calorie deficit needed for weight loss. These work alongside, not instead of, exercise and diet changes.
To find out if you're eligible for weight loss medication in the UK, your first step is to speak with your GP. They assess your BMI (healthy range is 18.5–24.9 for most adults, though lower thresholds apply for South Asian and Black heritage backgrounds) and any weight-related health conditions like high blood pressure or type 2 diabetes. Use our free BMI calculator above to check your current BMI instantly. If eligible, you may be referred to an NHS specialist weight management service or explore private prescribing options.
- 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.
What's the best type of gym workout for losing weight?
A combination of cardiovascular exercise (150+ minutes weekly) and resistance training (twice weekly) is most effective. HIIT workouts offer time-efficient calorie burn. The "best" programme is the one you'll stick with consistently — whether that's gym classes, personal training, or independent workouts. Results require sustained effort over weeks and months.
How quickly will I lose weight with a gym programme alone?
With a structured gym programme and reduced calorie intake, most people lose 0.5–1 kg per week. This depends on starting weight, diet, consistency, and individual metabolism. Results vary significantly between individuals. Combining exercise with dietary changes produces better outcomes than exercise alone.
Can prescription weight loss medication help my gym results?
Yes, for eligible UK adults. Medications like Mounjaro and Wegovy help reduce hunger and support calorie deficit maintenance, making it easier to stick to exercise routines and dietary changes. They're prescription-only, require clinical assessment, and work best alongside regular activity and balanced eating.
How do I know if I'm eligible for weight loss medication in the UK?
Eligibility depends on your BMI and whether you have weight-related health conditions. Generally, adults with a BMI of 30 or above, or 27–29.9 with conditions like high blood pressure or type 2 diabetes, may qualify. Book an appointment with your GP to discuss your individual circumstances and access options.
Should I track my weight loss progress while doing a gym programme?
Yes, regular tracking helps you stay motivated and adjust your approach if needed. Our free progress tracker lets you log weight changes over time, spot trends, and celebrate milestones. Remember that muscle weighs more than fat, so measurements or how clothes fit can be equally valuable indicators alongside the scales.
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.