Today is all about amazing muscles. Some make up to 100,000 movements a day, one keeps pumping nonstop, and on another we all sit. Isabel, David and Flora explore the wonders of the muscular system, while Melly trains with an athlete and ...See moreToday is all about amazing muscles. Some make up to 100,000 movements a day, one keeps pumping nonstop, and on another we all sit. Isabel, David and Flora explore the wonders of the muscular system, while Melly trains with an athlete and Omar reveals the powerful rhythm of the heart.
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