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
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Best Classes for Weight Loss — A UK Health Guide
Finding the right exercise class is one of the most effective ways to support sustainable weight loss alongside a balanced diet. Whether you're looking for high-energy cardio, strength-building sessions, or low-impact alternatives, the best classes for weight loss are those you'll actually stick with long-term. Combined with healthy eating habits and, for some, prescription weight loss medication, regular exercise classes can help you achieve meaningful health improvements. This guide covers the most effective class options available across the UK and how they support weight management.
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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.
Most Effective Exercise Classes for Weight Loss
High-intensity interval training (HIIT) classes are among the most effective for weight loss. These fast-paced sessions burn significant calories during the workout and create an "afterburn effect" where your body continues burning calories for hours afterward. HIIT classes typically combine short bursts of intense exercise with recovery periods, making them time-efficient and suitable for busy schedules.
Spinning and indoor cycling offer sustained cardio in a motivating group environment. A typical 45-minute session burns 400–600 calories, and the competitive atmosphere often encourages participants to push harder. Low-impact spinning is also gentler on joints than running-based classes, making it accessible for those with existing knee or hip concerns.
Dance-based classes like Zumba, dance cardio, and street jazz combine calorie burn with enjoyment. Participants often lose track of time, making these excellent for sustained effort. Dance classes typically burn 300–500 calories per hour and improve cardiovascular fitness whilst being more engaging than traditional steady-state cardio.
Strength and resistance training builds lean muscle mass, which increases resting metabolic rate—meaning you burn more calories even at rest. Body pump, resistance classes, and circuit training support weight management alongside muscle tone improvement.
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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.
Combining Classes with Overall Weight Management Strategy
Exercise classes are most effective when combined with NHS weight management principles: a balanced, reduced-calorie diet and consistent physical activity. The recommended target is 150 minutes of moderate-intensity activity weekly, which multiple classes can easily support.
For some adults, prescription weight loss medication may be appropriate alongside lifestyle changes. If you have a BMI of 30 or above, or 27 or above with weight-related health conditions such as type 2 diabetes or high blood pressure, your GP can assess whether weight management support is suitable for you.
Use our free BMI calculator above to check your current BMI and understand where you sit on NHS guidance. Track your progress with our progress tracker as you combine classes with dietary changes. Sustainable weight loss typically occurs at 0.5–1 kg per week, and consistency matters more than intensity.
- 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 many calories do exercise classes actually burn?
Calorie burn varies by class type, intensity, and individual fitness level. HIIT burns 400–600+ calories per hour, spinning 400–600 calories, dance classes 300–500 calories, and strength classes 250–400 calories. Higher intensity and body weight affect total burn. Heavier individuals typically burn more calories in the same workout.
Can exercise classes alone lead to weight loss?
Exercise classes support weight loss but are most effective combined with dietary changes. A calorie deficit requires eating less energy than you burn. Classes create a calorie deficit through activity, but without reducing calorie intake, results are limited. The NHS recommends combining exercise with balanced nutrition for sustainable weight management.
What's the best class for beginners starting weight loss?
Low-impact options like swimming, spinning, or dance cardio are ideal for beginners. These build fitness gradually, reduce injury risk, and are enjoyable enough to sustain long-term. Start with 2–3 classes weekly and gradually increase intensity. Always check with your GP before starting a new exercise programme, especially if you have existing health conditions.
How often should I attend classes to see weight loss results?
The NHS recommends 150 minutes of moderate-intensity activity weekly. This equates to roughly 3–4 classes of 45 minutes each. Consistency matters more than single intense sessions. Combine classes with rest days and strength work for balanced fitness and sustainable weight loss over weeks and months.
Do I need prescription weight loss medication alongside classes?
Not everyone needs medication. Exercise and diet changes alone support weight loss for many people. However, if you have a BMI of 30+, or 27+ with health conditions like diabetes, your GP can assess whether prescription support like GLP-1 weight loss medication may help. These are prescribed only after clinical assessment and work alongside, not instead of, lifestyle changes.
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.