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 Plan For Weight Loss And Toning
A structured gym plan is highly effective for weight loss and body toning, but combining exercise with weight management UK support can accelerate results. Most successful approaches pair regular fitness with dietary changes and, where eligible, prescription weight loss medication. This guide covers how to build an effective gym routine alongside the prescription options available through the NHS or private providers 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.
Prescription Weight Loss Options Available in the UK
For adults struggling with weight management uk despite diet and exercise, three prescription-only medications are licensed in the UK: Mounjaro (tirzepatide), Wegovy (semaglutide), and Saxenda (liraglutide). These work by reducing appetite and helping you feel fuller after smaller meals, making your gym efforts more sustainable.
- Mounjaro: Once-weekly injection, dual GLP-1 and GIP mechanism. Average weight loss in clinical trials was 15–21% of body weight over 72 weeks when combined with lifestyle changes.
- Wegovy: Once-weekly injection, GLP-1 agonist. Clinical trials showed approximately 15% average body weight loss alongside diet and exercise.
- Saxenda: Daily injection, GLP-1 agonist. Approved for longer-term weight loss management in eligible adults.
All three are prescription-only and require clinical assessment to establish eligibility. When combined with your gym routine and reduced-calorie diet, prescription weight loss injections can significantly enhance results compared to exercise and diet alone.
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 vs Private Access and Getting Started
NHS access: Weight loss medication nhs is available through specialist tier 3 weight management services. You'll need a GP referral and assessment by a specialist. Availability and waiting times vary significantly by region (ICB).
Private access: Available through GPhC-registered online prescribers without waiting for NHS services. Following a brief online assessment, eligible adults can access prescription weight loss medication privately.
Eligibility: You may qualify if you have a BMI of 30 or above, or 27–29.9 with weight-related health conditions such as type 2 diabetes, high blood pressure, or sleep apnoea. A prescriber will assess your individual circumstances. Use our free BMI calculator to check your starting BMI, and discuss prescription options with your GP if you're interested in exploring weight loss medication alongside your gym plan.
- 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.
Will taking prescription weight loss medication mean I don't need to exercise anymore?
No. Prescription weight loss medication is designed to work alongside, not replace, exercise and diet. Clinical trials showing the best results combined the medication with reduced-calorie diet and increased physical activity. Your gym plan remains essential for cardiovascular health, muscle tone, and long-term sustainability.
How do I know if I'm eligible for prescription weight loss medication in the UK?
You may be eligible if you have a BMI of 30 or above, or 27–29.9 with weight-related health conditions like type 2 diabetes, high blood pressure, or sleep apnoea. Discuss with your GP, who can refer you to specialist services, or speak with a private prescriber through an online assessment.
Can I get weight loss injections like Mounjaro or Wegovy on the NHS?
Yes. Mounjaro and Wegovy are available through NHS specialist weight management services, but access and waiting times vary significantly by region. Your GP can refer you to tier 3 services. Private access is also available without NHS referral if you prefer faster access.
How long does it take to see results with prescription weight loss medication and gym work combined?
Most people notice appetite reduction within 1–2 weeks of starting medication. Measurable weight loss typically becomes apparent after 4–6 weeks when combined with consistent gym work and dietary changes. Results vary significantly between individuals.
Is bmi weight loss the same as overall body composition improvement?
BMI measures weight relative to height but doesn't distinguish between muscle and fat. Your gym plan will build muscle while reducing fat, which is ideal for toning. Your appearance and health may improve even if BMI changes slowly. Track both BMI and how clothes fit for a fuller picture of 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.