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

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

Sit-ups: Techniques, benefits and variations on the classic

The 4 Dumbest Ab Exercises - T Nation Content - COMMUNITY - T NATION

5 Amazing Six Pack Abs Exercises that are Superior to Boring Sit Ups

5 Essential Core Exercises

How to Do Oblique Crunches, Step-by-Step, Abs and Core Exercises

Planks vs. Push-Ups: Which Are Best for Your Fitness Goals?

Sit-Ups: Correct Way To Do, 8 Variations, Benefits

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

Why You Can Stop Doing Sit-Ups - WSJ

Fitness

Fitness

The 10 Best Sit-Up Alternatives for a Stronger, More Powerful Core