Best Exercises for Metabolism: A UK Guide

The best exercises for metabolism combine resistance training, high-intensity interval training and regular aerobic activity to support calorie burning both during and after exercise. Metabolism encompasses all the chemical processes your body uses to convert food into energy, and exercise is one of the most effective tools for influencing how efficiently those processes work. This article explains which exercise types have the strongest evidence behind them, how often to train, how diet and sleep interact with metabolic rate, and when symptoms such as unexplained weight gain or fatigue warrant a GP review.

What does metabolism actually mean for your health?

Metabolism covers all chemical processes converting food into energy, with basal metabolic rate (BMR) making up the largest share of daily energy expenditure. Muscle mass, age, sex and thyroid function are key influences on metabolic rate.

Metabolism refers to all the chemical processes your body uses to convert food and drink into energy, and its rate directly influences how efficiently your body burns calories at rest and during activity. Every cell in your body depends on these processes to function, from breathing and circulating blood to repairing tissue and regulating hormones. The term is often used loosely to mean how quickly someone burns calories, but it encompasses a far broader set of biological functions.

Your total daily energy expenditure has three main components: your basal metabolic rate (BMR), which accounts for the energy used at rest; the thermic effect of food, meaning the energy needed to digest and absorb nutrients; and the energy used during physical activity. BMR typically makes up the largest share of total daily energy expenditure, though the precise proportion varies between individuals depending on body composition, age and activity level.^[6]

Several factors influence metabolic rate, including age, sex, body composition, genetics, thyroid function and hormonal status. Muscle tissue is metabolically more active than fat tissue, meaning people with greater muscle mass tend to have a higher resting metabolic rate.^[5][6] Understanding these factors helps explain why lifestyle choices, particularly exercise habits, can meaningfully influence how your metabolism functions over time.

Which types of exercise boost your metabolism the most?

Resistance training and HIIT most consistently raise metabolic rate during and after exercise. A combination of HIIT, strength work and moderate aerobic activity offers the broadest metabolic benefit.

High-intensity interval training (HIIT) and resistance exercise are among the exercise formats most consistently associated with increases in metabolic rate, both during and after a session. Both approaches stimulate the body in ways that elevate calorie burning not only during the session itself but also for a period afterwards, a phenomenon sometimes called excess post-exercise oxygen consumption (EPOC). It is worth noting that the magnitude and duration of EPOC are variable and often modest relative to the total energy cost of exercise; the effect should not be overstated.

HIIT involves alternating short bursts of intense effort with brief recovery periods. This format challenges the cardiovascular system and muscles simultaneously, creating a significant metabolic demand. Research, including systematic reviews published in journals such as the British Journal of Sports Medicine, suggests that HIIT can produce meaningful post-exercise increases in oxygen consumption, though individual responses differ.^[7][9]

Aerobic exercise, such as brisk walking, cycling, swimming or jogging, also contributes meaningfully to overall energy expenditure and supports cardiovascular health. While the post-exercise metabolic boost from steady-state cardio is generally smaller than that from HIIT or resistance training, regular aerobic activity improves mitochondrial efficiency, which supports long-term metabolic health.

For most people, a combination of exercise types offers the broadest benefit:

• HIIT sessions (two to three times per week) for post-exercise calorie burn

• Resistance training (at least two days per week, in line with UK CMO guidance) to build and preserve muscle mass

• Moderate aerobic activity (most days) to support cardiovascular and metabolic function

Choosing activities you enjoy and can sustain consistently is more important than selecting the theoretically optimal format.

Important safety note: If you have a heart condition, diabetes with complications, high blood pressure, a musculoskeletal condition, or if you are pregnant, deconditioned, or new to vigorous exercise, speak to your GP before starting HIIT or any high-intensity programme. Build intensity gradually and stop if you experience chest pain, dizziness or breathlessness.

How often should you exercise to keep your metabolism working well?

UK CMO guidelines recommend at least 150 minutes of moderate aerobic activity and strength training on two or more days per week. Spreading activity across the week and reducing prolonged sitting supports metabolic health.

Current UK physical activity guidelines, published by the Chief Medical Officers and endorsed by NHS England, recommend that adults aim for at least 150 minutes of moderate-intensity aerobic activity or 75 minutes of vigorous-intensity activity per week, alongside muscle-strengthening activities on two or more days.^[1][2] Meeting these targets supports metabolic health alongside cardiovascular, musculoskeletal and mental wellbeing.

Frequency matters as much as total volume. Spreading activity across the week, rather than concentrating it into one or two sessions, helps maintain a more consistently elevated metabolic rate and reduces prolonged sedentary periods. UK CMO guidance also recommends regularly breaking up long periods of sitting with light movement; research supports the benefit of this for blood glucose regulation and metabolic markers, though specific intervals such as a five-minute walk every hour are not formally specified in UK guidance.^[1][2]

For those new to exercise, starting gradually and building frequency over several weeks reduces injury risk and supports long-term adherence. A realistic starting point might be three sessions per week, progressing towards five or more as fitness improves. Rest and recovery days remain important, as muscle repair during rest is itself a metabolically active process.

It is also worth noting that non-exercise activity thermogenesis (NEAT), the energy expended through everyday movements such as walking, standing and fidgeting, can contribute substantially to daily calorie burn. Increasing general daily movement, not just structured exercise, is a practical and evidence-supported strategy for supporting metabolic rate.

Does strength training really make a difference to metabolic rate?

Strength training raises resting metabolic rate by increasing muscle mass, which burns more calories at rest around the clock. Compound movements such as squats and deadlifts produce the greatest metabolic stimulus.

Strength training genuinely raises resting metabolic rate by increasing muscle mass, which is more metabolically active than fat tissue and therefore burns more calories even at rest. This effect is well-supported by evidence and represents one of the more durable ways to influence basal metabolic rate over the long term, though the absolute increase in resting metabolic rate from muscle gained is typically modest and varies between individuals and studies.

Skeletal muscle accounts for a significant proportion of resting energy expenditure. When resistance training stimulates muscle growth (hypertrophy), the body must expend more energy to maintain that additional tissue around the clock, not just during exercise. Systematic reviews of resistance training interventions confirm a positive effect on resting metabolic rate, though effect sizes are generally small to moderate at the whole-day level.^[8][10]

Strength training also produces an EPOC effect, during which the body continues to consume elevated levels of oxygen and burn additional calories for a period after a session ends, as it repairs muscle fibres and restores physiological balance. Compound movements that engage multiple large muscle groups simultaneously, such as squats, deadlifts, rows and press-ups, tend to produce the greatest metabolic stimulus.

Beyond its direct metabolic effects, resistance training offers additional benefits relevant to metabolic health:

• Improved insulin sensitivity, which supports blood glucose regulation^[9][10]

• Preservation of muscle mass during weight loss, helping to prevent the metabolic slowdown often associated with calorie restriction

• Bone density support, particularly important as people age

For adults concerned about metabolic decline with age, which is partly attributable to age-related muscle loss (sarcopenia), incorporating regular resistance training is one of the most evidence-based strategies available. If you are new to resistance training, starting with lighter loads, focusing on correct technique and progressing gradually will reduce injury risk. The NHS Strength and Flex programme offers a beginner-friendly introduction.

How diet and lifestyle habits support an active metabolism

Adequate protein intake, seven to nine hours of sleep and good hydration are the most important lifestyle factors supporting metabolic rate. Very low-calorie diets below 800 kcal per day can suppress metabolism and should only be used under medical supervision.

Adequate protein intake is one of the most important dietary factors for supporting metabolic rate, as protein has a higher thermic effect than carbohydrates or fats and helps preserve muscle mass during periods of calorie restriction. The UK reference nutrient intake (RNI) for protein, as set by the Scientific Advisory Committee on Nutrition (SACN), is 0.75 grams per kilogram of body weight per day for adults. Those engaged in regular resistance training may benefit from higher intakes; the British Dietetic Association and sports nutrition consensus guidance generally suggest a range of around 1.2 to 2.0 grams per kilogram per day for active individuals, though individual needs vary.

Sleep quality has a direct and often underappreciated influence on metabolic function. Poor or insufficient sleep disrupts hormones including leptin, ghrelin and cortisol, which regulate appetite and energy balance.^[14][15] The NHS recommends that most adults aim for seven to nine hours of sleep per night. Chronic sleep deprivation is associated with increased appetite, reduced insulin sensitivity and a tendency to lose muscle rather than fat during weight loss.

Hydration also plays a role. Water is required for virtually every metabolic reaction in the body, and even mild dehydration can impair physical performance and reduce the efficiency of metabolic processes. NHS guidance recommends around six to eight drinks per day, with water, lower-fat milk and sugar-free drinks all counting towards this total.^[16] Drinking adequate fluid throughout the day, particularly around exercise, supports optimal function.

Other lifestyle factors worth considering include:

• Managing chronic stress, as persistently elevated cortisol can promote fat storage and muscle breakdown

• Limiting ultra-processed foods, which observational evidence associates with poorer metabolic and gut health outcomes, though the evidence base is still developing and causality is not fully established

• Avoiding very low-calorie diets (generally defined as below 800 kcal per day), which can suppress metabolic rate as the body adapts to reduced energy availability; NICE guidance on obesity notes that very low-calorie diets have a limited role and should only be used under medical supervision

For those exploring structured weight management support, Bolt Pharmacy is a GPhC-registered UK online pharmacy offering online weight-management consultations, with prescriber review and pharmacist support, alongside a range of evidence-based options a prescriber may consider where clinically appropriate.

When should you speak to a GP about a slow metabolism?

See a GP if you have unexplained weight gain, persistent fatigue, cold intolerance, dry skin or hair loss, as these may indicate hypothyroidism, diagnosed via TSH blood test under NICE NG145. Other conditions including PCOS and type 2 diabetes can also affect metabolism.

You should speak to your GP if you are experiencing persistent, unexplained weight gain, significant fatigue, cold intolerance, constipation, dry skin or hair loss, as these can be symptoms of an underactive thyroid (hypothyroidism), a treatable medical condition that directly slows metabolic rate. These symptoms warrant investigation rather than being attributed solely to lifestyle factors. Symptoms in the opposite direction, such as unexplained weight loss, palpitations or heat intolerance, may suggest an overactive thyroid (hyperthyroidism) and also warrant assessment.

Hypothyroidism is diagnosed through a blood test measuring thyroid-stimulating hormone (TSH) and, where indicated, free thyroxine (T4), in line with NICE guidance on thyroid disease assessment and management (NICE NG145).^[19][20] Treatment with levothyroxine, where indicated, can restore thyroid function and normalise metabolic rate. Other conditions that can affect metabolism include type 2 diabetes, polycystic ovary syndrome (PCOS), Cushing's syndrome and adrenal insufficiency, all of which require medical assessment.

It is important to note that a subjective sense of having a slow metabolism is not always indicative of an underlying medical condition. Many people who feel they gain weight easily have metabolic rates within the normal range, and lifestyle factors, including diet, activity levels and sleep, are more commonly the primary drivers. A GP can help distinguish between medical and lifestyle causes through appropriate history-taking and investigation.

You should contact your GP if you notice:

• Unexplained weight changes despite no significant change in diet or activity

• Persistent fatigue that does not improve with rest

• Symptoms suggestive of thyroid or hormonal dysfunction

• Difficulty losing weight despite sustained lifestyle changes over several months

If you experience sudden severe symptoms such as chest pain or difficulty breathing, call 999 immediately. For urgent but non-emergency concerns, NHS 111 can provide guidance. If you suspect that a medicine you are taking has caused an unwanted effect, you can report this to the MHRA via the Yellow Card scheme at yellowcard.mhra.gov.uk.

Scientific References

1. UK Chief Medical Officers' Physical Activity Guidelines.
2. Physical Activity Guidelines: UK Chief Medical Officers' Report.
3. Physical Activity Guidelines for Adults Aged 19 to 64.
4. Benefits of Exercise.
5. Skeletal Muscle Metabolism Is a Major Determinant of Resting Energy Expenditure.
6. Body Composition Components Associated with Sex Differences in Resting Metabolic Rate Among Japanese Athletes.
7. Magnitude and Duration of Excess Post-Exercise Oxygen Consumption Between High-Intensity Interval and Moderate-Intensity Continuous Exercise: A Systematic Review.
8. The Effect of Exercise Interventions on Resting Metabolic Rate.
9. Effects of Sprint Interval Training on Markers of Metabolic Health: A Three-Level Meta-Analysis of Randomised Controlled Trials.
10. Effects of Combined Aerobic and Resistance Training on Glycemic Control, Blood Pressure, Inflammation, Cardiorespiratory Fitness and Quality of Life in Patients with Type 2 Diabetes and Overweight/Obesity: A Systematic Review and Meta-Analysis.
11. Effects of Frequency and Duration of Interrupting Sitting on Cardiometabolic Risk Markers.
12. Metabolic Effects of Breaking Prolonged Sitting With Standing or Light Walking in Older South Asians and White Europeans: A Randomized Acute Study.
13. Sport and Exercise Nutrition.
14. Connecting the Dots Between Sleep Deprivation and Obesity: The Role of Melatonin in Appetite Regulation and Insulin Sensitivity.
15. Targeting the Leptin-Ghrelin Axis for Obesity Management: Mechanistic Insights and Therapeutic Approaches.
16. Water, Drinks and Hydration.
17. Overweight and Obesity Management (NG246) — Full Guideline PDF.
18. Overweight and Obesity Management (NG246) — Physical Activity and Diet Chapter.
19. Thyroid Disease: Assessment and Management (NG145).
20. Thyroid Disease: Assessment and Management — Recommendations (NG145).

Frequently Asked Questions