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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Gym Exercise Routine for Weight Loss
A structured gym exercise routine is one of the most effective ways to support sustainable weight loss when combined with dietary changes. Whether you're looking to lose weight in the UK or simply improve your fitness, regular exercise at the gym boosts calorie burn, builds muscle, and improves metabolic health. This guide covers evidence-based routines, frequency, and how to combine gym work with other weight management approaches for best 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.
Building an Effective Gym Routine for Weight Loss
An effective gym routine for weight loss should combine cardiovascular exercise and resistance training. The NHS recommends that adults aim for at least 150 minutes of moderate-intensity aerobic activity per week, plus strength training on two or more days. Here's a practical structure:
- Cardiovascular exercise: Treadmill, rowing machine, cycling, or elliptical for 30–45 minutes, 3–4 times per week at moderate intensity (where you can talk but not sing)
- Resistance training: Weight lifting or bodyweight exercises (squats, push-ups, deadlifts) for 20–30 minutes, 2–3 times per week to preserve muscle mass during weight loss
- Flexibility: Stretching or yoga for 10–15 minutes to aid recovery and reduce injury risk
For sustainable weight loss in the UK, aim for a calorie deficit of around 500 kcal per day through a combination of reduced dietary intake and increased activity. This typically results in losing approximately 0.5–1 kg per week, which the NHS considers a safe and sustainable rate. Use our free BMI calculator above to track your current weight category, and the weight converter to monitor progress in your preferred units.
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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 Exercise with Diet and Medical Support
Regular gym exercise alone may support modest weight loss, but the most effective approach combines exercise with dietary changes and, where appropriate, medical support. 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 may discuss prescription weight loss medication options including GLP-1 injections. These prescription weight loss treatments work alongside exercise and diet, not instead of them. Try our GLP-1 weight loss calculator to explore potential outcomes if this approach is relevant to you. Consistency matters more than intensity—building a sustainable gym habit you can maintain long-term delivers better results than intense short-term efforts.
- 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 often should I go to the gym for weight loss?
The NHS recommends at least 150 minutes of moderate-intensity aerobic activity weekly, plus strength training twice weekly. This typically means 4–5 gym sessions per week. However, consistency matters more than frequency—3 well-structured sessions per week combined with dietary changes can still deliver meaningful weight loss results.
What's the best gym exercise for weight loss?
A combination of cardiovascular exercise and resistance training is most effective. Cardio burns calories during the session, while strength training preserves muscle mass and boosts metabolism long-term. High-intensity interval training (HIIT) can maximise calorie burn in shorter sessions, but moderate steady-state exercise is more sustainable for most people.
Can gym exercise alone help me lose weight?
Exercise alone can support weight loss, but results are more significant when combined with dietary changes. A calorie deficit of around 500 kcal per day (through diet and exercise combined) typically results in losing 0.5–1 kg per week according to NHS guidance. If you're struggling to lose weight, your GP can explore additional support options.
How long does it take to see weight loss results from gym exercise?
Most people notice improvements in energy, fitness, and body composition within 4–6 weeks of consistent gym work. Visible weight loss typically becomes noticeable after 8–12 weeks of combined exercise and dietary changes. Our progress tracker can help you log changes beyond just the scales.
Should I combine gym exercise with weight loss medication?
If you're eligible for prescription weight loss medication (such as GLP-1 injections), these work best alongside regular exercise and dietary changes, not instead of them. Your GP or prescriber can assess whether medication is appropriate for your situation and how to combine it effectively with your gym routine.
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.