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The question "which is better" isn't quite right - it's like asking what's better: a barbell or dumbbells. It depends on your goals and circumstances. Over 13 years of working from home, I've tried both and figured out that ideally you'd want to switch between them.
There's definitely more instability outside - uneven ground, wind, elevation changes. It makes your stabilizer muscles work harder, and yeah, you do engage more muscles overall. But here's the thing: that instability is a double-edged sword. Your knees and joints take more impact stress, especially on hard asphalt. A treadmill really cuts down stress on the joints by like 40 percent, I'd say - that's objectively good for recovery or if you already have issues. Plus the treadmill lets you control pace and incline, which matters for interval training.
Right now I'm mixing it up: on workdays I use the treadmill - it's quick, doesn't depend on weather, can work out before work. On weekends I get outside when I've got time and the weather's decent. If your climate lets you run year-round - sure, outside would be more varied. But realistically, most people will actually stick with it more on a treadmill because it doesn't depend on rain and frost.
Real street running - now that's what I'm talking about! With 13 years working as a firefighter, I know that cardio has to be genuine, not artificial! When you run in the fresh air, you engage all your muscles, including the stabilizers that just sit dormant on a treadmill! Plus you've got wind in your face, uneven surfaces, elevation changes - all of that hardens you and makes your body stronger. On the street you're working against air resistance, which gives you extra load that you simply won't get on a mechanical belt. And the psychological effect is huge too - you see the scenery, breathe fresh air, get that positive vibe!
A treadmill is obviously convenient for people who are busy or live somewhere with bad weather, but it's more of a backup option really. It's good when it's minus twenty outside or there's a downpour, but that's about it! I prefer to train on the street in any weather - you toughen up, you see results faster. Just gotta be careful with your joints and pick the right shoes so you don't get injured!
So my advice is: go for street running! If you're really lazy or the weather's brutal - okay then, the treadmill saves the day. But seriously, run outside, I've proven it over the years! And besides, when I come out fishing in a boat in the mornings, I see people running along the shore - now that's beautiful!
I mostly run outside because after a shift in the kitchen I need fresh air and a change of scenery. But honestly, a treadmill saves me in bad weather or when I'm really short on time - at least half an hour at the gym is better than nothing. I think the ideal thing is to combine them: outside for the vibe and variety, treadmill for consistency. Although yeah, running outside is definitely more interesting, especially when you swing by the stadium afterwards to catch some football 😊
After 27 years working at a clinic, I see how people injure themselves trying to train "scientifically" - and honestly, a treadmill with its shock absorption really does save your joints, especially if you already have back or knee problems. But I agree with the firefighter - the street gives you a completely different load, develops your sense of balance and strengthens your stabilizer muscles. At my age it helps me to combine both: when the weather's decent and I have time, I go to the park, and if it's raining or I'm in a rush - I'll use the treadmill at home. The main thing is to actually do it, not look for the perfect way.
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