If you suffer from a bad back, you know just how frustrating it can be to do everyday tasks, including workouts and especially ab exercises. That's because your core and your back are closely linked.

Here are the five best and worst exercises for back pain. Capitalize on the benefits of back exercises while avoiding exacerbating any existing issues. View post: Is Tom Cruise Playing the Miami Vice ...

Flexion or extension of a certain body part typically refers to joints. Flexing a joint usually means closing it, and decreasing the angle between the body parts, while extending a joint means opening ...