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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Swimming Workouts For Weight Loss
Swimming is an excellent low-impact exercise that can support weight loss when combined with a balanced diet and healthy lifestyle. This guide explores how swimming helps with weight management in the UK, the calories you can burn during different swimming activities, and how to create an effective swimming workout routine. Whether you're just starting out or looking to intensify your routine, swimming offers flexibility and proven cardiovascular benefits for sustainable weight loss.
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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.
How Swimming Supports Weight Loss
Swimming is one of the most effective forms of cardiovascular exercise for weight management in the UK. During a 30-minute swimming session, an average adult can burn between 200–350 calories, depending on intensity, swimming style, and body weight. Higher intensity swimming (such as front crawl or butterfly) burns more calories than gentle breaststroke.
- Front crawl at moderate pace: approximately 250–300 calories per 30 minutes
- Breaststroke at steady pace: approximately 180–220 calories per 30 minutes
- Butterfly stroke (high intensity): approximately 300–350 calories per 30 minutes
- Treading water or aqua jogging: approximately 150–200 calories per 30 minutes
Unlike running or high-impact sports, swimming is gentle on joints whilst still offering significant calorie expenditure. This makes it particularly suitable for people carrying excess weight who may experience joint strain with other exercise types. The water provides natural resistance, engaging multiple muscle groups simultaneously—shoulders, core, legs, and back—which increases overall energy expenditure and supports metabolism.
Clinically BackedWeight Loss
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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.
Building an Effective Swimming Weight Loss Plan
The NHS recommends at least 150 minutes of moderate-intensity aerobic activity per week for adults. Swimming is an excellent way to meet this target whilst supporting sustainable weight loss.
- Beginner routine: 2–3 sessions per week, 20–30 minutes each, at a comfortable pace
- Intermediate routine: 3–4 sessions per week, 30–45 minutes, mixing steady-state and interval training
- Advanced routine: 4–5 sessions per week, 45–60 minutes, incorporating sprint sets and varied stroke work
Weight loss requires a calorie deficit of approximately 500 kcal per day for sustainable loss of around 0.5 kg per week. Swimming supports this by burning calories during exercise and boosting metabolism. Track your progress using our free progress tracker to monitor both activity and weight changes over time. Combine your swimming routine with a balanced diet and adequate hydration for best results.
- 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 times per week should I swim to lose weight?
The NHS recommends at least 150 minutes of moderate-intensity activity weekly. For weight loss, aim for 3–4 swimming sessions per week of 30–45 minutes each. Consistency matters more than frequency—regular weekly activity supports sustainable weight loss better than occasional intensive sessions. Combine swimming with a balanced diet for optimal results.
Does swimming burn more calories than running?
Swimming and running burn similar calories per session (approximately 250–350 calories per 30 minutes for an average adult), but swimming is lower-impact on joints. Swimming also engages more muscle groups simultaneously due to water resistance, making it excellent for overall fitness. Choose based on what you can sustain long-term and what suits your joints and fitness level.
Can I lose weight with swimming alone?
Swimming supports weight loss but works best alongside dietary changes. To lose weight, you need a calorie deficit—typically 500 kcal daily for approximately 0.5 kg per week loss. Swimming burns calories during exercise, but nutrition determines whether you maintain a deficit overall. Use our free BMI calculator to assess your current weight category and set realistic targets with your GP.
What's the best swimming stroke for weight loss?
Front crawl and butterfly burn the most calories (250–350 per 30 minutes) because they're high-intensity and engage multiple muscle groups. However, any stroke you can sustain consistently offers weight loss benefits. Breaststroke (180–220 calories per 30 minutes) is excellent for beginners. Mix different strokes to prevent boredom, engage different muscles, and maintain motivation.
Should I combine swimming with other weight loss approaches?
Yes. Exercise alone rarely produces significant weight loss without dietary changes. The NHS recommends combining regular physical activity with a balanced, calorie-controlled diet. Some people also benefit from prescription weight loss support through their GP. If you're carrying excess weight (BMI over 25), your GP can discuss whether additional support like weight loss medication might suit your circumstances alongside exercise.
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.