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Core strength testing has come a long way from the straight-legged, twisting sit-ups used before World War II.
How to Do a Correct Sit-Up, Plus Benefits and Variations
Mastering Functional Core Workouts for Peak Performance
Sit-Ups Benefits: Exercises, Variations, and More
Sit-Ups Benefits: Exercises, Variations, and More
11 Core Exercises for People Who Hate Crunches, Sit-Ups and Planks
Exercising with Diastasis Recti - Which Ab Exercises Are Safe?
Benefits of Planks, Proper Form, and Variations - York Fitness
15-Minute Ab Workout, Abs and Core Exercises
Pavel Tsatsouline's Guide to Pushups, Sit-Ups, and Squats