For years, sit-ups were considered the ultimate ab exercise. But modern research shows they’re not the safest or most ...

Find out how many sit-ups after 55 signal a strong, healthy core and use this 60-second test to track your strength over time.

I don't have any real issue with sit-ups, but my tailbone isn't a fan. The good news is you don’t need to do sit-ups to build a strong core. If you're like me and can take or leave sit-ups, there are ...

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