Exercises like weighed sit-ups and lying leg raises can help build defined abs, physique coach Cliff Wilson said. You should train the abs like you train any other muscle by adding resistance, he said ...

While a lot of effective core exercises have you working out on a mat on the floor, there are other loftier options. Just look up to add some variety to your core routine, and try a hanging leg raise.

Lie on the floor/mat on your back. Keep lower back in contact with the floor, feet and legs straight and together. Place hands to sides or under lower back for support. Action Keeping legs straight ...