Which activity is primarily isometric?

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Multiple Choice

Which activity is primarily isometric?

In an isometric exercise, the muscle contracts to hold a position without changing the joint angle. A plank fits this: you brace your core and hold the body in a straight line, keeping joints like the elbows and hips still while the muscles continually work to maintain that position. The other activities involve movement through a range of motion. A bicep curl shortens and lengthens the muscle as you lift and lower the weight, which is dynamic. A leg extension moves the knee through an arc against resistance, also dynamic. Running is all about repeated joint movement and propulsion, which is highly dynamic. So the plank, being a static hold, is primarily isometric.

In an isometric exercise, the muscle contracts to hold a position without changing the joint angle. A plank fits this: you brace your core and hold the body in a straight line, keeping joints like the elbows and hips still while the muscles continually work to maintain that position.

The other activities involve movement through a range of motion. A bicep curl shortens and lengthens the muscle as you lift and lower the weight, which is dynamic. A leg extension moves the knee through an arc against resistance, also dynamic. Running is all about repeated joint movement and propulsion, which is highly dynamic.

So the plank, being a static hold, is primarily isometric.

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