Develop your core with Bruce Lee's intense ab workout. Exercises like waist twists and leg raises can help you build strength ...

Sit-ups (where the upper body is lifted completely) and crunches (where only the shoulder blades lift off the ground) are classic abdominal exercises. Photo: Getty Images Sit-ups and crunches are two ...

There are two kinds of people in this world: People who want to work their core and people who consider core exercises their worst nightmare. But regardless of which camp you fall into, if you are ...

Four minutes of wall ball sit-ups. That was at the end of a recent CrossFit workout I took, and I was floored by how much this exercise worked my arms — they got sore faster than my abs! Jade Jenny, ...