When it comes to abdominal exercises, crunches are probably the first that come to mind. But are they doing more harm than good? We've got the answer.
Crunches won't give you a flat stomach: Southwest Family Medicine
How To Do Crunches And Whether They Help Build A Six-Pack
How to Do Sit-Ups: Techniques, Benefits, Variations
4 Reasons Why You Should Not Do Crunches
The best way to do ab crunches for six-pack abs - The Fitness Maverick
Is it a good or bad idea to do crunches everyday? - Quora
How to do Crunches the Right Way to Eliminate Neck Pain
Are Sit-Ups Good For You?
5 Reasons You Should Be Doing Ab Workouts
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Tip: Do Crunches, But Follow This Rule