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> Another thing, 3 hours a day spent on walking alone seems like a waste of time to me. Walking is a terrible form of exercise, it's meant to save energy.

I don’t doubt that there are diminishing returns, but I don’t think it’s fair to say that “walking is a terrible form of exercise.” I was just reading _Built to Move_, and they contend that one hour of intense exercise followed by an otherwise sedentary lifestyle does not make you healthy. Walking might not be the best cardiovascular activity, but it is good for your hips, alignment, digestive tract, promotes healthy sleep schedule, etc.

> Another thing, 3 hours a day spent on walking alone seems like a waste of time to me.

Good job I'm not you then.

Walking fast with a steep slope is a good way to exercise I think. Andrew Weil even wrote that walking is a complete form of exercise: you don't need anything else to be a good athlete. But I guess it is a long hard walk, not a short easy one. I walk regularly and I found that it was really demanding if I do that in the woods with regular slopes. And sometimes I run a little bit, alternating walk and run.