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
How Does Exercise Help With Weight Loss?
Exercise is a crucial part of effective weight management in the UK. While diet creates the calorie deficit needed to lose weight, regular physical activity boosts metabolism, preserves muscle mass during weight loss, and improves overall health outcomes. The most effective weight loss strategy combines regular exercise with dietary changes—and for some people, prescription weight loss medication may also play a role alongside these lifestyle changes. Understanding how exercise fits into a sustainable weight loss cycle helps you achieve long-term results.
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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.
The Role of Exercise in a Weight Loss Cycle
Exercise contributes to weight loss through multiple mechanisms. Calorie burn during activity directly reduces your energy surplus, while metabolic adaptation means regular activity helps maintain your metabolic rate during calorie restriction. This is crucial—without exercise, weight loss can slow as your body adapts to eating fewer calories.
- Cardiovascular exercise (walking, cycling, running) burns significant calories and improves heart health
- Resistance training preserves muscle mass, which is essential because muscle tissue burns more calories at rest than fat
- Combined activity (cardio plus strength work) produces better weight loss outcomes than either alone
- The NHS recommends 150 minutes of moderate aerobic activity per week for adults
Exercise also provides mental health benefits—improved mood, reduced stress, and better sleep quality—all of which support sustainable weight loss. For UK adults working toward weight management, starting with activities you enjoy makes adherence far more likely.
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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.
Creating a Sustainable Exercise Cycle
A sustainable exercise cycle typically involves progressive consistency rather than intense short bursts. Start with moderate activity you can maintain—a 30-minute walk most days is more effective long-term than unsustainable gym sessions. Build gradually: week one might be three sessions, week two four sessions, establishing a routine your body adapts to.
For weight management, combine different activity types: aerobic exercise on some days, strength training on others, and active recovery (stretching, gentle walking) in between. Use our free BMI calculator to track where you stand now, and our progress tracker to monitor changes over time. Track not just weight—also note energy levels, how clothes fit, and strength improvements. These non-scale victories keep motivation high during plateaus.
- 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 much exercise do I need to lose weight?
The NHS recommends at least 150 minutes of moderate aerobic activity weekly. For weight loss specifically, combining cardio with 2–3 strength sessions weekly produces best results. However, calorie deficit from diet remains the primary driver—exercise amplifies results rather than replacing dietary changes.
Can exercise alone cause weight loss without changing diet?
Exercise alone is less effective than combining diet and activity. A typical moderate workout burns 300–500 calories, but weight loss requires consistent calorie deficit. Most evidence suggests that combining modest dietary changes with regular exercise produces sustainable, lasting results compared to exercise-only approaches.
How long before I see weight loss results from exercising?
Initial changes (improved energy, better sleep, clothes fitting differently) may appear within 2–3 weeks. Measurable weight changes typically appear after 4–6 weeks of consistent exercise combined with dietary changes. Everyone progresses differently—use our progress tracker to record your individual timeline.
Should I exercise if I'm taking weight loss medication?
Yes. Prescription weight loss medications like Mounjaro or Wegovy work best alongside regular exercise and dietary changes. Exercise preserves muscle mass during weight loss, improves cardiovascular outcomes, and supports long-term health. Your prescriber can advise on activity levels appropriate for you.
What's the best exercise type for weight loss—cardio or strength training?
Both are valuable. Cardio burns calories during activity; strength training preserves muscle, which maintains metabolic rate. Combining them produces the best outcomes. Choose activities you enjoy—you're more likely to stick with cycling, swimming, or walking if you genuinely like them rather than forcing yourself into uncomfortable routines.
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.