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The Russian twist is a staple ab workout, but the way that most people do the move is ineffective and even bad for your back. Here's how to do it the right way.

Some people also find that holding their tongue against the roof of their mouth during sit-ups can help them avoid neck pain.

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A 92-year-old woman, Li, from Hunan, China, is proving that age is just a number when it comes to fitness. Her intense morning regimen features 200 push-ups, 100 sit-ups, and even hula-hoop spins.

Performing sit-ups on the bed, which is easier on the joints for a person of her age. Pushing up directly on the floor. Hula hooping to develop coordination and strength in the core.