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
Gym Weight Loss Programs in the UK
Gym weight loss programs combine structured exercise routines with dietary changes to help you reach a healthy weight. Whether you're looking to lose weight uk through fitness alone or alongside medical support, a well-designed programme can help you achieve sustainable results. Most effective gym programmes include both cardiovascular exercise and strength training, alongside personalised nutrition guidance. For many people, combining gym work with prescription weight loss medication—available through NHS weight loss services or private prescribing—offers the best chance of success. Your GP can advise on the best approach for your individual health needs.
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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 Gym Weight Loss Programs Work
Effective gym weight loss programs operate by creating a calorie deficit—burning more calories through exercise than you consume through food. The NHS recommends losing weight at a sustainable rate of 0.5 to 1 kg per week, which typically requires a deficit of around 500 kcal per day.
- Cardiovascular exercise: Running, cycling, swimming, or rowing burn significant calories and improve heart health
- Strength training: Building muscle increases your metabolic rate, helping you burn more calories at rest
- Class-based programmes: Group fitness classes provide accountability and motivation
- Personal training: A trainer creates a customised plan tailored to your fitness level and weight loss goals
Many gym programmes now incorporate prescription weight loss medication as part of a holistic approach. GLP-1 weight loss injections like Mounjaro or Wegovy may help reduce appetite and food cravings, making it easier to maintain a calorie deficit while exercising. These are prescription-only medicines available through NHS specialist services or private prescribing following clinical assessment. Combined with structured gym work and dietary changes, they can support more significant weight loss outcomes than either approach alone.
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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.
Combining Gym Work with Weight Management Strategies
The most effective gym weight loss programs integrate multiple strategies. Start by calculating your healthy weight range using your BMI—our free BMI calculator can help you determine what weight is healthy for your height. Then combine regular gym attendance (3–5 sessions per week) with a balanced, calorie-controlled diet rich in protein and whole foods.
If you're struggling to lose weight through gym work and diet alone, discuss prescription weight loss options with your GP. Eligible adults with a BMI of 30 or above, or 27 or above with weight-related health conditions, may qualify for medical weight management support. Our GLP-1 weight loss calculator can help you explore how prescription medications might support your gym goals. Track your progress weekly using our free progress tracker to stay motivated and identify what's working best for you.
- 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 150 minutes of moderate-intensity exercise per week (roughly 30 minutes, 5 days weekly) combined with strength training twice weekly. However, weight loss is primarily driven by creating a calorie deficit through diet—gym work accelerates results and improves health markers like blood pressure and fitness. More frequent gym attendance doesn't necessarily equal faster weight loss without dietary changes.
Can I lose weight through gym work alone without changing my diet?
Weight loss requires a calorie deficit, which is much harder to achieve through exercise alone. A typical gym session might burn 400–600 calories, but this is easily offset by overeating afterwards. Combining gym work with a reduced-calorie diet creates the deficit needed for sustainable weight loss. Most successful gym weight loss programs are 80% diet and 20% exercise.
What's the best type of gym exercise for weight loss?
A combination of cardiovascular exercise (running, cycling, swimming) and strength training works best. Cardio burns calories during exercise; strength training builds muscle, which increases your metabolic rate long-term. High-intensity interval training (HIIT) burns calories efficiently in shorter timeframes. The best exercise is one you'll do consistently—find what you enjoy.
Are gym weight loss programs effective without medication?
Yes—many people lose weight successfully through gym work and diet changes alone. However, if you've tried gym programmes and diet without success, prescription weight loss medication may help. GLP-1 medications like Mounjaro or Wegovy are prescription-only and available through NHS services or private prescribing. They're most effective combined with gym work, not instead of it.
How do I know if I need prescription weight loss medication?
Your GP can assess eligibility based on your BMI and health conditions. Adults with a BMI of 30 or above, or 27 or above with weight-related conditions like type 2 diabetes or high blood pressure, may qualify. Prescription weight loss medication is typically offered after lifestyle changes (including gym work) have been tried, or alongside them for better results. Book an appointment with your GP to discuss options.
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.