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Understanding Calorie Burn & Exercise
The relationship between exercise and calorie burn is fundamental to understanding fitness, weight management, and health. Yet many people significantly overestimate how many calories they burn during exercise — and underestimate how much their resting metabolism contributes to daily energy expenditure. This calculator uses MET (Metabolic Equivalent of Task) values — the most scientifically validated method of estimating exercise calorie expenditure — to give accurate, personalised results.
Why Weight Matters So Much in Calorie Calculations
The MET formula (Calories = MET × weight (kg) × time (hours)) makes clear why body weight is such a powerful determinant of calorie burn. A 90 kg person walking for 30 minutes burns approximately 50% more calories than a 60 kg person doing the same walk at the same pace. This means that as people lose weight, they naturally burn fewer calories doing the same exercise — which is one reason why weight loss plateaus occur and why calorie intake targets need regular recalibration as weight changes.
The Myth of "Spot Reduction" and Exercise Alone
Exercise is important for health and metabolism, but its direct contribution to weight loss is often overstated. A typical 30-minute moderate run burns approximately 300 kcal for a 70 kg person — equivalent to a single slice of pizza or a medium soft drink. This does not diminish the value of exercise — its benefits for cardiovascular health, mental health, muscle preservation, and metabolic rate are profound — but it illustrates why diet quality remains the dominant factor in weight management. The most successful long-term weight management combines dietary change with exercise, using each for what it does best.
Sports Nutrition at Enavec Pharmacy
Protein powders, creatine, pre-workout, BCAAs, electrolytes, and expert pharmacist guidance on sports supplements and exercise nutrition. Reach your goals faster.
Zone 2 Training — The Longevity Workout
Zone 2 cardio — exercising at 60-70% of maximum heart rate, at a pace where you can hold a full conversation — is increasingly recognised as the most important cardiorespiratory training zone for both longevity and fat metabolism. At Zone 2 intensity, the body primarily burns fat (rather than carbohydrates) for fuel, and over time develops more and healthier mitochondria — the cellular energy factories whose function declines with age and inactivity. Elite endurance athletes typically spend 80% of their training in Zone 2. For general health and longevity, 150 minutes of Zone 2 cardio per week is considered the minimum effective dose.