Most tradies who lift think about cardiovascular fitness in one of two ways: either it's something runners do, or it's something they already get from being on the tools all day. Both assumptions are wrong, and both are quietly undermining your performance and your health.
Here's what VO2 max actually is, why it matters more than you think, and how to improve it without spending three hours a week jogging.
What VO2 Max Actually Is (Plain English)
VO2 max is your body's maximum oxygen uptake — the ceiling of how much oxygen your cardiovascular system can deliver to your muscles during hard exercise. The higher your VO2 max, the more efficient your heart, lungs, and muscles are at using oxygen to produce energy.
In practical terms: a bloke with a high VO2 max can sustain harder physical effort for longer, recovers faster between bouts of exertion, and has more aerobic capacity to draw on when the job gets demanding. A bloke with a low VO2 max runs out of steam earlier, takes longer to recover, and is working at a higher percentage of his ceiling for any given physical task.
VO2 max also turns out to be one of the strongest predictors of long-term health and all-cause mortality. Higher cardiovascular fitness in midlife is associated with significantly lower risk of heart disease, stroke, type 2 diabetes, and cancer. It matters way beyond the gym.
Why Being on the Tools Doesn't Fix It
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Here's the thing most tradies assume: "I'm active all day, so my cardiovascular fitness must be decent." And it's partially true — blokes on site are generally in better shape than sedentary office workers. But it's a long way from actually developing strong cardiovascular fitness.
Most physical work on site operates at a low intensity — walking, carrying, bending, occasional heavy lifting. This is mostly aerobic work at a low heart rate, which is good for general health but doesn't meaningfully improve VO2 max. To actually improve your cardiovascular ceiling, you need to push your heart rate into a higher zone — zone 2 (roughly 60–70% of max heart rate, sustained for 20+ minutes) and occasionally higher.
The sporadic high-intensity moments on site — the heavy lift, the sprint to catch something — are brief and unstructured. They're not enough to drive adaptation. You need consistent, deliberate cardiovascular training on top of the job.
Lifting-only gym programmes also don't cut it. Strength training improves muscular strength and to some extent local muscular endurance, but it doesn't meaningfully improve VO2 max or cardiac output. You need both.
3 Ways to Improve VO2 Max That Fit a Tradie Schedule
You don't need to become a runner. You don't need to train for a half marathon. These three approaches work, are time-efficient, and don't require anything beyond basic gear.
1. Rucking (Loaded Walking)
Rucking — walking with a loaded backpack — is one of the best cardiovascular training methods for tradies because it's low-impact, easy on joints that are already taking a beating, and directly mimics the physical demands of the job.
Start with 10–15kg in a backpack and walk at a pace that gets your heart rate up — roughly conversational pace, but breathing a bit harder. 30–45 minutes, 2–3 times a week. This is genuine zone 2 cardio that improves cardiovascular efficiency over time, without pounding your joints the way running does.
As a bonus, it's dead time you can use productively — listen to a podcast, walk the dog, do it on your lunch break if you can.
2. Stair Sprints
For the tradies who want higher intensity with minimal time investment: find a staircase (multi-storey car park, stadium steps, tall building) and sprint up, walk down. 6–8 rounds, 2–3 times a week.
This kind of high-intensity interval training (HIIT) has strong evidence behind it for improving VO2 max in less time than steady-state cardio. The reason is that hitting high intensity forces your cardiovascular system to adapt upward — you're pushing against your ceiling, which forces it to rise.
Ten minutes of stair sprints twice a week will move your cardiovascular fitness more than walking on site all day. It's not pleasant, but it's fast.
3. Twice-Weekly 20-Minute Zone 2 Jog
If your joints are holding up and you're comfortable running, two 20-minute steady jogs a week at a conversational pace is the most straightforward way to build zone 2 aerobic capacity. You should be able to hold a full conversation throughout — if you can't, slow down.
Zone 2 training is the foundation of cardiovascular fitness. It builds mitochondrial density, improves fat utilisation as a fuel source, and strengthens the heart muscle. It's not glamorous, but it works.
If running bothers your knees or feet, replace this with a bike (stationary or outdoor) or a rowing machine at the gym — same heart rate zone, less joint impact.
The Lifting vs. Cardio Trade-Off
A lot of tradies who do lift worry that cardio will eat into their muscle gains. There's a real phenomenon called "concurrent training interference" — doing too much cardio can compromise strength development. But the dose makes the poison.
Two to three 20–30 minute cardio sessions a week will not meaningfully affect your muscle gains, especially if you keep them low-to-moderate intensity (zone 2). The risk comes from doing high-volume endurance training on top of a strength programme — that's not what we're talking about here.
The bottom line: both strength and cardiovascular fitness matter. Lifting alone makes you stronger but doesn't protect your heart. Cardio alone doesn't build the muscle mass that protects joints, boosts metabolism, and maintains function as you age. Do both. Not a lot of both — just enough of both.
Why This Matters Long-Term
Trades are one of the higher-risk occupational categories for cardiovascular disease. The combination of physical strain, chronic stress, poor diet patterns, irregular sleep, and high rates of smoking historically creates a bad environment for heart health.
The good news is that cardiovascular fitness is highly trainable at any age, and improvements in VO2 max translate directly into reduced cardiovascular disease risk. A 2022 study found that each unit increase in VO2 max (measured in mL/kg/min) was associated with an 11–17% decrease in cardiovascular mortality. This is not abstract — it's one of the most powerful levers you have on your long-term health.
The Bottom Line
Working on the tools keeps you active but doesn't improve your cardiovascular ceiling. Add 2–3 sessions of deliberate cardio per week — rucking, stair sprints, or zone 2 jogging — and your energy on site, recovery between lifts, and long-term heart health will all improve meaningfully. This is not optional maintenance work; it's one of the highest-value things you can do for your body.