This is my opinion only based upon what has worked for me. Walking will work if it is done at a high enough intensity or long enough and you watch what you eat. Add some muscle building and you will see faster results. The walking should be in addition to what you would normally do anyway, not supplant it.
"It does not matter how slowly you go, so long as you do not stop" (Confucius)
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Life is like riding a bicycle. To keep your balance you must keep moving.
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