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The Organs of your body have their sensory touches at the bottom of your foot, if you massage these points you will find relief from aches and pains as you can see the organs are on right and left foot, the heart is on the left foot.
It is indeed correct since the nerves connected to these organs terminate here. So when we walk, we will always be pressing these pressure points and thus keeping these organs activated at all times. Keep walking...
For a change - http://www.wholehealthmd.com