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If you ever wondered: are sit-ups a waste of time? Click here and discover what you can do about it.
Do sit-ups build your abdominal muscles as fast as push-ups do for your arms/chest/back? - Quora
L-Sit: The Toughest Body Weight Core Exercise You're Not Doing - Swimming World News
Sit Ups Are A Waste Of Time
Why do so many people waste their time doing sit-ups expecting
Squat University
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The Core Training Reality Check
Fitness Experts: Sit-Ups Are Worthless, Here's What to Do Instead
Is it just me or are sit-ups a waste of time?
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