Key Takeaways
Option A
Aerobic Training
The heart-health and endurance cornerstone.
Best for: Men looking to improve cardiovascular health, manage weight, and support mental well-being over time.
Option B
Resistance Training
The muscle and metabolic strength builder.
Best for: Men aiming to preserve muscle mass, strengthen bones, and maintain metabolic health as they age.
If your main priority is heart health and endurance
Aerobic Training
Aerobic exercise has the strongest evidence base for reducing cardiovascular disease risk and improving heart and lung function over time.
If you're concerned about muscle loss and metabolic health as you age
Resistance Training
Muscle mass naturally declines after age 30; resistance training is the most effective tool for slowing that process and supporting metabolic rate.
If you want the broadest long-term health protection
Aerobic Training
Research consistently shows that combining both types is optimal, but if you can only choose one starting point, aerobic exercise addresses the leading causes of mortality in men.
If you are a complete beginner with limited time
Resistance Training
Even two short sessions per week of resistance training can meaningfully improve strength, bone density, and metabolic markers in men new to exercise.
What Each Type of Training Actually Does
When people talk about exercise, they often use "cardio" and "strength training" loosely — but the physiological effects are quite distinct. Understanding these differences helps men make smarter choices at any life stage.
Aerobic training — also called cardiovascular or cardio exercise — involves sustained, rhythmic movement that raises your heart rate over an extended period. Think jogging, cycling, swimming, or brisk walking. The primary adaptation is in the cardiovascular system: your heart becomes more efficient at pumping blood, your lungs improve at extracting oxygen, and your body becomes better at burning fat as fuel. For an overview of the major aerobic formats, see HIIT, LISS, and steady-state cardio explained.
Resistance training — which includes free weights, machines, and bodyweight exercises — challenges muscles against a load, causing microscopic damage that the body repairs by building stronger, larger muscle fibres. The primary adaptations are muscular and skeletal: greater strength, improved bone density, and a higher resting metabolic rate. Resistance training, weight machines, and bodyweight work each build strength differently, but all stimulate this adaptive process.
| Criterion | Aerobic Training | Resistance Training |
|---|---|---|
| Primary system targeted | Cardiovascular and respiratory | Muscular and skeletal |
| Key long-term benefit | Reduced heart disease and stroke risk | Preserved muscle mass and bone density |
| Effect on metabolism | Improves insulin sensitivity | Raises resting metabolic rate |
| Mental health impact | Strong evidence for mood and cognition | Emerging evidence for anxiety and depression |
| Age-related relevance | Critical from early adulthood onwards | Increasingly important after age 30 |
| Beginner accessibility | High — walking is a valid starting point | High — bodyweight exercises require no equipment |
Long-Term Health Outcomes for Men
The long-term case for each type of exercise is built on decades of research, and both are compelling.
Aerobic training over time
Regular aerobic exercise is associated with lower rates of heart disease, stroke, and type 2 diabetes — conditions that disproportionately affect men, particularly after age 40. It also supports healthy blood pressure, reduces LDL (low-density lipoprotein, often called "bad") cholesterol, and improves insulin sensitivity. Beyond the physical, consistent cardio has a well-documented effect on mood and cognitive function, partly through its influence on brain-derived neurotrophic factor (BDNF), a protein that supports brain health.
Resistance training over time
From around age 30, men lose roughly 3–5% of muscle mass per decade in a process called sarcopenia. Left unchecked, this contributes to functional decline, weight gain, and increased injury risk. Resistance training directly counters this. It also strengthens connective tissue, improves joint stability, and supports bone mineral density — a significant concern as men age. Metabolically, more muscle tissue means a higher resting calorie burn, which helps with long-term weight management.
3–5%
Muscle mass lost per decade after 30
Research on sarcopenia estimates men lose this proportion of muscle mass per decade without resistance training intervention.
~35%
Reduction in cardiovascular mortality risk
Studies published in journals such as the British Journal of Sports Medicine suggest regular aerobic exercise is associated with substantial reductions in cardiovascular mortality.
It's also worth noting that resistance training carries mental health benefits often underappreciated outside fitness circles. Evidence suggests it can reduce symptoms of anxiety and depression, separate from any improvements in physical appearance.
Why Combining Both Is the Stronger Strategy
Research consistently shows that men who engage in both aerobic and resistance training experience greater reductions in all-cause mortality risk than those who perform only one type. The two systems complement each other rather than compete.
Aerobic work supports cardiovascular recovery between strength sessions. Resistance training helps preserve the lean muscle mass that aerobic exercise, if performed in very high volumes without adequate nutrition, can sometimes erode. Together, they address almost every major risk factor for chronic disease in men — from blood pressure and cholesterol to blood sugar regulation and bone fragility.
Mixing workout types is also one of the most effective strategies for sustaining long-term exercise habits, since variety reduces boredom and overuse injuries. For men who want a truly complete programme, flexibility and mobility work rounds out the picture, supporting movement quality that both aerobic and resistance training depend on.
No Single Formula Fits Every Man
Public health guidelines — such as those from the World Health Organization — generally recommend at least 150 minutes of moderate aerobic activity per week alongside muscle-strengthening activities on two or more days. However, these are population-level targets, not personal prescriptions. Your optimal balance depends on age, health status, current fitness, and goals. A certified exercise professional or your GP can help you build a programme suited to your individual circumstances.
How much of each you need depends on your current health, goals, and life stage — which is why a conversation with a qualified healthcare provider or certified exercise professional is a valuable starting point, especially if you have an existing health condition.
This article is for general informational purposes only and is not a substitute for professional medical or fitness advice. Always consult a qualified healthcare provider before starting a new exercise programme, particularly if you have existing health conditions.