Did-you-know?

iVillage Member
Registered: 03-19-2003
Did-you-know?
Wed, 09-16-2009 - 9:34pm
Give a tennis ball a good, hard squeeze. You're using about the same amount of force your heart uses to pump blood out to the body. Even at rest, the muscles of the heart work hard—twice as hard as the leg muscles of a person sprinting.

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