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 heart is on the left foot. Typically they are shown as points and arrows to show which organ it connects to. It is indeed correct since the nerves connected to these organs terminate here. This is covered in great detail in Acupressure studies or textbooks.
To create the scrub, just mix together half a cup of coarse brown sugar with a tablespoon of honey, a little olive oil, and 1/4 tablespoon of fresh lemon juice, then apply all over your body and rinse. The scrub not only smells delicious, but leaves your skin feeling ultra-smooth.