Are Crunches Worth the Effort?

For a study published this year, researchers at Indiana State University had a group of healthy, young adults squat, lunge, twist, crunch and hold a rigid plank position to measure the hardiness of their back, abdominal and side muscles, the area generally known as the core. The same volunteers then completed a battery of physical performance tests, including leaping off the ground while tossing a medicine ball backward over the head and sprinting through a short obstacle course.

The researchers had expected that the volunteers with the sturdiest cores would outshine the others on the tests of physical performance. But they did not. There was little correlation in this study between robust core muscles and athleticism. Despite the emphasis that many coaches, trainers and athletes themselves place on “core training for increased performance,

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