Keep your legs as straight as possible, and lift both feet up as high as you can. Focus on really pulling from your hip ...

Personal trainers agree that to achieve a strong and functional abdomen, it is not enough to do hundreds of traditional ...

For this exercise, kneel in front of your ball, with your shins up against it. Then, place your hands on the ground, making sure your arms are straight from your shoulders down to your wrists.

To crunch, squeeze your abdominal muscles, hold for a few seconds and then un-curl back to the start position. Repeat. Many athletes perform crunches and other abdominal exercises by “throwing ...

Crunches get a bad rap, but they're a solid core exercise. Here's how to do crunches correctly, including 14 other types of crunches you can do.

And when it comes to working your core, you can use all types of equipment whether that be medicine balls, dumbbells, a kettlebell, or a good ol' exercise ball filled with air.

3. Stability ball crunches This move will result in a serious core burn. As you build up strength, it will be easier walking (or running!) up the stairs. You’ll also feel more stable as you do so.