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Walking has several benefits. Both my Grandpas walked a lot. One died when he was 87 (but he had diabetes). The othe grandpa is still alive and very active and he is 95. He still walks a lot. However if you want to improve, I would recommend increasing the slope (5-10) degree even if you are just walking at a normal pace. This will increase your heart rate and exercise, and by keeping the same pace you dont risk ruining your joints like some high impact exercises do (running, jump rope etc)
Walking is great, try mixing it up with walking in nature, hiking hills, walking up the stairs etc. You will be breathing fresh air and oxygen which is even better for you. Its a great exercise! Good luck!
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- Thank you for the encouragement. Happy New Year!