It very doable.
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Yeah i think i could manage 200m in 90 seconds.
Big question is whether i could extend that to 10k. Not sure about that tbh.
Very doable if you run often enough.
I couldnt do it right now, but a sub hour 10k would be very achievable within 3 months if I got my head into it.
Only 3 years ago (aged 58) I managed to break 50 minutes.
Almost killed me though 
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I’ve certainly benefited from slow treadmill running over winter but for me, I also find that if I dont go crazy on volume I do better. I could certainly do 10k like that but i dont think the time would be anything to write home about.
I’ll have another go this week and see where I’m at.
I find a fast paced 5k treadmill walk, 7.5 km/hr is just as beneficial as a 5k run at 11 or 12 km/hr.
Maybe someone with a better knowledge on all things fitness can confirm if this theory is accurate?
Shouldn’t be more beneficial.
There will be benefits to walking 5km in the treadmill at your speed. But running 5k at 11kmph should be consuming more calories.
Agreed.
But walking 5k at 7.5 km/hr means youre exercising for 12 minutes longer
Dont know how accurate the treadmills are, but both the run and walk show calorie burn of around 280.
I know you continue to burn afterwards until the heart rate returns to resting levels too.
It’s math. More calories burned means more gains. Time rarely factors into that.
It’s maths 
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The treadmill calorie count won’t be accurate.
You burn more than twice the number of calories by running than you do by walking.
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Even if you walk for twice as long?
a 5km walk would take you around 40 min ?
whereas the same run would be around 28 min.
you’d need to roughly do an hour’s walk to consume as much calories as what a half hour run would provide. Even that would depend on the speed of the walk. If you’re running at a speed of 12km/h , you’re walking speed should be 6-7km/jh
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Important to note that the pace of the walk has a lot to do with it - a ‘power walk’ pace (so maybe Dane’s fast-paced walk) is a less energy efficient gait than most people’s normal walking pace. Excess calories burned per km approach a slow run speed. We probably instinctively slip into a jog to conserve energy in a relative sense.
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Yup.
I power walk as I find walking at a leisurely pace is kind of a waste of time.
Generally my 5k power walk will take around 39 minutes
It’s easier for me to jog at 8kmph than try and maintain a brisk walk at 7. Namely , easier on the knees.
Its something i picked up on. There’s evidence (apparently) that shows slow paced runs, zone 2 or basically at a pace that allows you to have a conversation has actual performance benefits down the line. It should probably be mixed in with some intervals as well to really reap the benefits.
All in, it may have helped.
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That depends on how fast the walking is and how fast the running is, obviously. But even if you account for the higher rate of calories burned per minute at faster paces, as @Dane 's real world data points out, when he factor back in the longer duration it essentially balances itself out to have the same caloric expenditure.
There is a good argument for the faster pace deriving more benefit in terms of the fitness adaptations it produces, but in practice we have to consider things like what impact the harder session will have on recovery and ability/likelihood to do it repeatedly throughout the week.
General rule of thumb is that cardio develops best (and the health benefits that go along with it) with a mix of some hard sessions around the majority of easier sessions. Secondly, when planning those out it is important to avoid the trap of making your easy sessions too hard and your hard sessions too easy.
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What I’ve found when losing weight is to not over-obsess on what the most efficient workout is and do whatever it is that you can turn into a habit. For me it was brisk walks on the treadmill at first.
Of course if your goal is chasing PRs, disregard the above.
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