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 Program — What Works in the UK
A gym weight loss program combines regular exercise, structured training, and often dietary changes to help you lose weight sustainably. In the UK, effective weight loss programmes typically involve both physical activity and either lifestyle changes alone or prescription medication alongside gym work. The NHS recommends losing weight at a rate of 0.5 to 1 kg per week. Your approach will depend on your current BMI, health status, and personal goals. Use our free BMI calculator above to assess where you stand, then explore the options outlined below to find the right programme for you.
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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 Effective Are Gym Weight Loss Programmes?
Research shows that exercise alone typically produces modest weight loss—around 2–3 kg over 6 months without dietary changes. However, combining gym work with a reduced-calorie diet produces significantly better results, with average losses of 5–10 kg or more over the same period.
- Resistance training (weights) preserves muscle mass during weight loss and boosts metabolic rate
- Cardiovascular exercise (running, cycling, swimming) burns calories effectively and improves heart health
- Combination programmes mixing cardio and strength training show the best outcomes for sustainable weight management uk
The key is consistency: structured gym attendance combined with calorie deficit produces results. For adults with a BMI of 30 or above, or 27 or above with weight-related health conditions, prescription weight loss medication may be recommended alongside gym activity to accelerate progress.
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.
NHS Weight Loss and Prescription Options
The NHS weight loss pathway offers support at different levels. Your GP can refer you to a tier 3 specialist weight management service, where options including prescription medications may be discussed. Two GLP-1 weight loss injections licensed in the UK—Mounjaro and Wegovy—can support weight loss when combined with exercise and diet.
Clinical trials show participants on Mounjaro lost an average of 15–21% of body weight, and Wegovy users lost approximately 15%, though individual results vary significantly. These are prescription-only medicines requiring clinical assessment. Try our GLP-1 weight loss calculator to estimate potential results at different doses. Whether using medication or diet and exercise alone, consistent gym attendance and calorie tracking remain essential for 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 gym exercise alone?
Yes, but results are modest without dietary changes. Gym exercise typically produces 2–3 kg weight loss over 6 months independently. Combining gym work with a 500 kcal daily calorie deficit increases loss to around 5–10 kg. Strength training also preserves muscle mass, which is crucial during weight loss.
What type of gym programme is best for weight loss?
Combination programmes mixing cardiovascular exercise (20–30 minutes, 3–5 times weekly) with resistance training (2–3 sessions weekly) work best. Cardio burns calories; strength training preserves muscle and boosts metabolism. Consistency matters more than intensity—sustainable routines beat sporadic intense efforts.
How long does a gym weight loss programme take to show results?
Most people notice changes within 4–6 weeks if combining exercise with dietary changes. Initial weight loss (0.5–1 kg per week) is visible first; then progress may plateau, which is normal. Use our free progress tracker to monitor changes beyond just weight, including fitness improvements.
Can I use gym workouts alongside weight loss medication?
Yes, absolutely. GLP-1 medications like Mounjaro and Wegovy are designed to be used alongside increased physical activity and reduced-calorie diet. Prescription weight loss medication accelerates results when combined with gym work, not instead of it. Your prescriber will advise on safe exercise during treatment.
Should I see my GP before starting a gym weight loss programme?
Yes, especially if you're over 40, have existing health conditions, or plan to start intensive exercise. Your GP can check your fitness level and recommend appropriate intensity. They can also discuss weight loss medication options and refer you to NHS weight management services if eligible.
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.