What You Need: A stability ball and a mat. This plank-focused routine uses the stability ball to activate deep core muscles, ...

These 6 core exercises improve strength, posture, and stability—no crunches required. Try them for a stronger, more balanced ...

Transition to a plank. We're going to do this with our ... 15-second break, we're going to move on to bird dog on the stability ball. You may have seen this one before on the floor, but a little ...