Our expert says:
I would aim for 30 minutes a day to start with. That 30 minutes could be spent either walking continuously, or you could alternate rest with walking. You might for example walk for 5 minutes, rest for 3, and repeat 4 times. As you get fitter, you can increase the intensity and reduce the rest periods.
Then, in perhaps 3 to 4 weeks, you can increase the total time - to 35 minutes, then 40 minutes, then 45 minutes. That's probably the target - 45 minutes, four to five times a week, but you'll need to build up to it.
As for calories, my advice is to focus on the time of exercise, and then you'll take care of the rest. Also, if weight is your concern, then diet is crucial and you need to sort that out as well. Perhaps as your top priority, even.
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