A group exercise instructor suggests to participants that they can make a plank easier by spreading their feet wider. Which of the following options best explains why this modification makes the exercise easier?
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AThis modification will not make the exercise easier, it will make it harder
BThe base of support is widened, increasing stability
CThe force required to hold the position is reduced
DThe effect of gravity is lessened through this modification
✓ Correct answer: B. The base of support is widened, increasing stabilityAnswer: The base of support is widened, increasing stability
When the base of support is widened, the body's center of gravity is better supported, reducing the muscular effort required to maintain balance and hold the position. Gravity, torque, and other forces remain constant, but the increased stability makes the exercise less challenging.
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Theory