The plank is a great way to strengthen abdominal, back, and shoulder muscles. You can also use this exercise position to locate your center of gravity. Holding plank position with a scale under his toes and another under his forearms, one athlete measured that 66.0% of his weight was supported by his forearms and 34.0% by his toes. (That is, the total normal forces on his forearms and toes were 0.660w and 0.340w, respectively, where w is the athlete’s weight.) He is 1.80 m tall, and in plank position the distance from his toes to the middle of his forearms is 1.53 m. How far from his toes is his center of gravity?

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The plank is a great way to strengthen abdominal, back,
and shoulder muscles. You can also use this exercise position to locate
your center of gravity. Holding plank position with a scale under his
toes and another under his forearms, one athlete measured that 66.0%
of his weight was supported by his forearms and 34.0% by his toes.
(That is, the total normal forces on his forearms and toes were 0.660w
and 0.340w, respectively, where w is the athlete’s weight.) He is 1.80 m
tall, and in plank position the distance from his toes to the middle of
his forearms is 1.53 m. How far from his toes is his center of gravity?

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