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 Routine For Weight Loss And Toning
A gym routine combining cardiovascular exercise and resistance training is one of the most effective ways to lose weight and build muscle tone. However, exercise alone produces slower results than when paired with dietary changes or prescription weight management options. In the UK, eligible adults can access GLP-1 medications like Mounjaro and Wegovy alongside their fitness plan, which may support more consistent weight loss and help you stay motivated during your training. This guide covers how to structure an effective routine and what medical support is available.
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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.
UK Prescription Weight Management Options
If you're following a structured gym routine for weight loss, you may be eligible for prescription weight management medication in the UK. Mounjaro (tirzepatide) and Wegovy (semaglutide) are dual or single GLP-1 receptor agonist medications licensed for weight loss. Both are once-weekly injections that may help reduce appetite and support feeling fuller after meals, making it easier to maintain a calorie deficit while training.
- Eligibility: BMI of 30 or above, or 27–29.9 with weight-related health conditions like high blood pressure or type 2 diabetes
- Clinical evidence: Clinical trials showed average weight loss of 15–21% with Mounjaro and approximately 15% with Wegovy over 68–72 weeks, alongside diet and exercise
- Saxenda (liraglutide): Another UK-licensed option—a daily GLP-1 injection with similar efficacy
Weight loss injections work best when combined with gym training and dietary changes, not as a replacement for either. Our GLP-1 weight loss calculator can help you estimate potential results at different doses.
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 How To Get Started
In the UK, prescription weight loss medication is available through two routes. NHS access requires referral to a specialist tier 3 weight management service via your GP—availability varies significantly by region and waiting lists can be lengthy. Private access is available through GPhC-registered online prescribing services following a clinical assessment, typically taking days rather than months.
Before starting any medication, discuss your fitness goals and weight loss plan with your GP. They can assess your BMI (calculate yours instantly with our free BMI calculator) and review your medical history to determine eligibility. For weight management UK advice specific to your circumstances, your healthcare provider can recommend the most suitable approach combining gym training, nhs weight loss support, and potentially prescription medication.
- 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 take weight loss injections while doing a gym routine?
Yes. GLP-1 medications like Mounjaro and Wegovy are designed to be used alongside exercise and dietary changes, not instead of them. In fact, clinical trials that demonstrated weight loss results included participants who exercised and followed a reduced-calorie diet. Your GP can advise on whether this combination is appropriate for you.
How quickly will I see results from gym training combined with prescription weight loss medication?
Individual results vary significantly. Gym training typically shows body composition changes (muscle gain, fat loss) within 4–8 weeks, though scale weight loss is often slower at first. GLP-1 medications take 4 weeks per dose level to escalate, with more noticeable results after 8–12 weeks. Most people see meaningful weight loss after 16–20 weeks on a therapeutic dose.
What's the difference between Mounjaro and Wegovy for weight loss?
Mounjaro (tirzepatide) is a dual GIP and GLP-1 agonist, while Wegovy (semaglutide) is a GLP-1 agonist only. Clinical trial data showed average weight loss of 15–21% with Mounjaro versus approximately 15% with Wegovy. Both are once-weekly injections. Your prescriber will assess which is more suitable for your health profile.
Do I need an NHS referral to get weight loss injections in the UK?
Not necessarily. NHS access requires a GP referral to a specialist weight management service, which has variable availability and waiting times. Private access is available through online prescribing without an NHS referral, following a clinical assessment with a UK-licensed prescriber. Both routes require a valid prescription.
What if I'm not eligible for prescription weight loss medication?
If you don't meet eligibility criteria, ask your GP about tier 1 or tier 2 NHS weight management support, which includes structured diet and exercise programmes. Many are free and highly effective, especially when you're already committed to a gym routine. Your GP can also monitor your progress and reassess eligibility in future if your circumstances change.
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.