Sit-Ups, Crunches, Planks, Knee-Ups: The Evolution of Core Fitness Testing

Core strength testing has come a long way from the straight-legged, twisting sit-ups used before World War II.

ACE - ProSource™: February 2014 - Reality Check: Are Planks Really

The Major Differences Between Sit-Ups and Crunches

The Major Differences Between Sit-Ups and Crunches

How to Perform a Picture-Perfect Sit-Up for Stronger Abs

Forget sit-ups — this 3-move ab workout chisels concrete core

Top 5 Core Exercises for Beginners

How to Improve Quickly on the Sit-Up Test

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Straight Legged Sit Ups Can Make You A Fitness Beast

Sit-Ups Benefits: Exercises, Variations, and More