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FACT: Your insides are actually shifting! When a coaster comes over its crest, slows for a second for added torture, and then plummets downward, the seat belt keeps your rear in place, but some loosely connected internal organs—like your stomach and intestines—get a little "airtime." But don't get concerned in light of these strange facts. You're not damaging your innards by riding even the craziest of coasters (everything returns to its proper place), but your nerves detect the movement, which registers as though your stomach has jumped into your throat.—Maged Rizk, MD, gastroenterologist at Cleveland Clinic's Digestive Disease Institute

Human Muscle Picture Human Muscle Xray Chest Stock Photography Image

Most people need to exercise with 50 to 85 percent of their highest possible heart rate. This is called target heart rate. To estimate your own personal maximum heartbeat, subtract your age from two hundred and twenty.

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