We’ve said it before and we’ll say it again — when it comes to building a rock-solid core, endless sit-ups and planks alone won’t do it. Not only does switching things up help you beat ...

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 ...

If you’re not sure how to do any of the exercises, watch the short video above, especially for the partial sit-up. Also, make sure you have something soft beneath you to support your back.