How Many Calories Do You Burn with Exercise? Part 1
Energy expenditure from physical activity is one of the fundamental pillars of applied physiology in sports, wellness, and body composition. In a context where the balance between caloric intake and consumption is central to weight control and the prevention of metabolic diseases, understanding how much and how calories are burned in various sports can make all the difference.
In this in-depth analysis, we will examine 10 of the most practiced physical activities in Italy, analyzing their biomechanical and physiological components, the energy cost based on MET (Metabolic Equivalent of Task), the energy substrates involved, hormonal response, and long-term adaptations. All caloric values are estimated for individuals weighing 60 kg and 75 kg, on an hourly basis.
1. Brisk Walking
Physiological type: low-impact aerobic activity with moderate muscle engagement. Predominant use of lipid oxidative metabolism.
MET and calories
- 4 km/h → 3 MET → 180 kcal (60 kg), 225 kcal (75 kg)
- 6 km/h → 4 MET → 240 kcal (60 kg), 300 kcal (75 kg)
Chronic adaptations: improves muscle capillarization, insulin sensitivity, and reduces resting heart rate.
Professional example: Olympic race walkers at 8–9 km/h can reach 6.5–7 MET, equivalent to ~450 kcal/h (60 kg).
2. Running / Jogging
Physiological type: medium-to-high intensity aerobic activity, with marked neuromuscular and cardiovascular components. Predominant carbohydrate consumption at high intensity.
MET and calories
- 8 km/h → 7 MET → 420 kcal (60 kg), 525 kcal (75 kg)
- 12 km/h → 11 MET → 660 kcal (60 kg), 825 kcal (75 kg)
Energy substrates: muscle and liver glycogen + free fatty acids.
Professional example: an elite marathon runner consumes 60–75 g/h of carbohydrates → over 1000 kcal/h.
3. Swimming
Physiological type: mixed effort activity (aerobic-anaerobic), with no joint impact but high hydrodynamic resistance. Requires high neuromotor coordination.
MET and calories
- Light freestyle: 7 MET → 420 kcal (60 kg), 525 kcal (75 kg)
- Vigorous freestyle: 10 MET → 600 kcal (60 kg), 750 kcal (75 kg)
Metabolic characteristics: high caloric expenditure for thermogenic maintenance in an aquatic environment.
Professional example: sprinters (100–200 m) can exceed 1200 kcal/h, with significant EPOC (Excess Post-exercise Oxygen Consumption).
4. Cycling / Spinning
Physiological type: high-performance cyclic aerobic activity. Predominant oxidative metabolism, with anaerobic intensifications during climbs or sprints.
MET and calories
- Moderate pace (18–20 km/h): 6.8 MET → ~410 kcal (60 kg), 510 kcal (75 kg)
- High intensity (>25 km/h): 10 MET → 600 kcal (60 kg), 750 kcal (75 kg)
Physiological effects: increased VO₂max, mitochondrial adaptations, improved lactate threshold.
Professional example: a Giro d’Italia cyclist consumes 5000–8000 kcal/day with an average of >900 kcal/h per stage.
5. Yoga / Pilates
Physiological type: isometric, proprioceptive, and respiratory neuromuscular activity. Medium-low metabolic involvement, but with effects on core stability and motor control.
MET and calories
- Hatha yoga: 2.5 MET → 150 kcal (60 kg), 190 kcal (75 kg)
- Power yoga / advanced Pilates: 4 MET → 240 kcal (60 kg), 300 kcal (75 kg)
Adaptations: improved flexibility, parasympathetic activation, cortisol reduction.
Professional example: an instructor leading 4 dynamic sessions a day can burn 1000–1200 kcal/day.
6. Zumba / Aerobics Dance
Physiological type: choreographed cardiovascular activity, with intermittent high-intensity bursts. Engages all muscles and stimulates the sympathetic system.
MET and calories
- Moderate intensity: 6 MET → 360 kcal (60 kg), 450 kcal (75 kg)
- High intensity: 8.5 MET → 510 kcal (60 kg), 640 kcal (75 kg)
Energy substrates: glycogen + lipids, with possible EPOC up to 24h.
Professional example: fitness instructors burn up to 800–1000 kcal/hour in choreographed HIIT classes.
7. Tennis
Physiological type: intermittent aerobic-anaerobic mixed sport. High neuromuscular component, explosive power, reactivity. Variable energy consumption.
MET and calories
- Recreational match: 7 MET → 420 kcal (60 kg), 525 kcal (75 kg)
- Competitive match: 10 MET → 600 kcal (60 kg), 750 kcal (75 kg)
Adaptations: increased VO₂max, lactic power, reaction time.
Professional: 3-hour match → 1800–2300 kcal (depends on surface type and rally duration).
8. Padel
Physiological type: similar activity to tennis, but with less distance covered and faster execution. Significant cardio and plyometric components.
MET and calories
- Amateur play: 5.5 MET → 330 kcal (60 kg), 410 kcal (75 kg)
- Competitive match: 7.5 MET → 450 kcal (60 kg), 565 kcal (75 kg)
Adaptations: improved hand-eye coordination, reactivity, muscle tone.
Professional: average 600–700 kcal/h in tournaments, with peaks of 800+ kcal/h in long doubles.
9. Functional Training / HIIT
Physiological type: anaerobic-alactic + lactic exercise, with aerobic phases. High post-exercise EPOC. Intense neuroendocrine stimulation.
MET and calories
- Moderate functional: 6 MET → 360 kcal (60 kg), 450 kcal (75 kg)
- Intense HIIT: 9–10 MET → 540–600 kcal (60 kg), 675–750 kcal (75 kg)
Endocrine response: increased GH (Growth Hormone), adrenaline, catecholamines; reduced basal insulinemia.
Professional: a coach leading two 45-minute HIIT sessions can also consume 1200–1500 kcal/day.
10. Hiking / Trekking
Physiological type: aerobic activity in a natural environment, on varied terrain, engaging core and postural stabilizers.
MET and calories
- Hill walking: 3.8 MET → 230 kcal (60 kg), 285 kcal (75 kg)
- Uphill trekking: 6.5 MET → 390 kcal (60 kg), 490 kcal (75 kg)
Aggravating factors: incline, altitude, load on shoulders, climate.
Professional example: CAI guide on a hike with a 12 kg backpack: >4000 kcal/day.
In the next article, we will explore 10 more disciplines – including team sports, skiing, power sports, and CrossFit – to provide an even more complete overview of the differences between activities from a metabolic and physiological perspective.
All data is derived from international sources: ACSM (American College of Sports Medicine), Compendium of Physical Activities (Ainsworth et al.), Harvard Health Publications, and clinical observations. The figures are indicative and should be contextualized for the individual, age, lean mass, and training status.