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Core strength testing has come a long way from the straight-legged, twisting sit-ups used before World War II.
Crunches Vs. Sit-Ups—Which Exercise Is Better?
The 4 Dumbest Ab Exercises - T Nation Content - COMMUNITY - T NATION
The Truth about Whether You Should Crunch or Plank Your Way to a Six-pack
Are sit-ups really the best way to tone your abs and what exercises would be better?
How to Do Oblique Crunches, Step-by-Step, Abs and Core Exercises
What are the differences between squats, lunges, and push-ups and crunches/ sit-ups and leg raises/planks? - Quora
The 10 Best Sit-Up Alternatives for a Stronger, More Powerful Core
Forget sit-ups — these 6 exercises will help you sculpt your abs
The Great Abs Mistake - Crunches And Situps And Still No Abs
Is 200 push ups, 200 squats and 200 crunches every other day enough to build an average body? - Quora