walking is not exercise unless you're really BIG. Big fellas can walk to the mail box and call it cardio. It takes a lot to lug around 300 plus pounds. your muscles are working hard to carry that much mass around and your heart is pumping ferociously (you hope) to push the blood in your system that far.
If your that big, then walking can be exercise but you need to have a good look at yourself and be sure of your life choices.
But...if you have even a mediocre level of general physical capability then walking is not going to do a lot for you.
The human body is designed for movement so it needs to maove to exercise, walking is the minimal movement pattern the human animal makes. Rolling over and stretching exercises more muscles than walking.
If your just starting out on a fitness or weight loss program then walking is where you start because its the simpilist motor recruitment pattern the manimal uses. As soon as you hit the 5 min continueous motion mark its time to up the ante. Steady state walking just doesn't stress the body enough to generate appropriate stress to forse physiological adaptation.
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