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
Weight Loss Workouts in the Gym — A UK Guide
Regular gym workouts are a key part of sustainable weight loss in the UK, but exercise alone rarely produces significant results without dietary changes. To lose weight effectively, most people need to combine gym exercise with a reduced-calorie diet and, in some cases, prescription weight loss medication. The NHS recommends that adults aim for at least 150 minutes of moderate-intensity aerobic activity each week, alongside strength training. This guide explains how to structure effective gym workouts for weight management alongside other evidence-based strategies.
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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.
Types of Gym Workouts for Weight Loss
The most effective gym workouts for weight management combine cardiovascular exercise and resistance training. Cardiovascular workouts (running, cycling, rowing) burn calories during the session and slightly elevate metabolic rate afterwards. Resistance training (weights, resistance bands) builds lean muscle, which increases resting metabolic rate — meaning you burn more calories throughout the day. For weight loss, the NHS recommends:
- 150 minutes of moderate-intensity cardio per week (or 75 minutes vigorous), spread across at least 3 days
- Strength training on at least 2 days per week, targeting all major muscle groups
- Flexibility and balance work (yoga, pilates) to support overall fitness
High-intensity interval training (HIIT) — short bursts of intense effort followed by recovery — is particularly efficient for weight loss because it burns calories during and after exercise (known as the 'afterburn effect' or EPOC). However, consistency matters more than intensity: a sustainable routine you can maintain is more effective than sporadic intense workouts.
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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 Gym Exercise with Weight Management Strategy
Exercise alone typically produces modest weight loss (usually 2–3 kg) without dietary changes. To achieve meaningful weight loss, gym workouts must combine with a reduced-calorie diet. The NHS recommends a calorie deficit of approximately 500 kcal per day, which supports a sustainable loss of around 0.5–1 kg per week. For many people in the UK seeking more support, prescription weight loss medications — used alongside diet and exercise — can significantly enhance results. Our GLP-1 weight loss calculator can help you understand potential outcomes when combining gym workouts with medication support. Track your progress consistently using our free progress tracker to stay motivated and monitor whether your current approach is working effectively.
- 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 days a week should I go to the gym for weight loss?
The NHS recommends at least 3–4 days per week for effective weight management. Ideally, combine 3 sessions of 50 minutes cardio with 2 sessions of strength training. However, consistency matters more than frequency — a realistic routine you can maintain long-term is better than an unsustainable schedule.
Will gym workouts alone help me lose weight without dieting?
Gym exercise alone typically results in modest weight loss (2–3 kg) because it's difficult to create a large enough calorie deficit through exercise alone. Weight loss requires both reduced calorie intake and increased activity. Most people see better results combining gym workouts with a healthier diet.
What type of gym workout burns the most calories?
High-intensity interval training (HIIT) burns the most calories per minute, but steady-state cardio burns significant total calories over longer sessions. The best workout is one you'll do consistently. Rowing machines, running, and cycling typically burn 400–800 kcal per hour depending on intensity and body weight.
Is weight loss prescription medication available on the NHS in the UK?
Yes, prescription weight loss medications like Mounjaro and Wegovy are available through NHS specialist weight management services, though access varies significantly by region and waiting lists can be lengthy. Private online prescribing is also available following clinical assessment by a UK-licensed prescriber.
Can I check my BMI to see if I'm in a healthy weight range?
Yes, use our free BMI calculator above to check your personal BMI instantly. A healthy BMI range is 18.5–24.9 according to NHS guidelines. If you're overweight or obese, your GP can discuss whether prescription weight loss support combined with gym workouts might benefit your health.
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.