It's common knowledge in fitness circles, but a lot of people don't know that the classic sit-up exercise — that staple of gym classes and boot-camp style training — is actually terrible for your back ...

You don't have to take a Pilates class to start incorporating Pilates exercises into your workout routine. Pilates movements are known for being particularly humbling, especially on the core.

The plank is one of the most effective exercises for building a stable core. But stick with it for too long and it can start to lose its edge, offering less of a challenge as your strength improves.

Add Yahoo as a preferred source to see more of our stories on Google. "Pilates addresses anti-rotation and oblique work directly through exercises like the saw, which train the obliques and deep ...