Carrie Underwood's trainer's at-home ab workout is so quick you can complete it during a commercial break. Here's how to do the three exercises using an ottoman in the comfort of your living room.
"The abs flex the spine in two main ways—from the top-down with your rib cage being pulled toward your pelvis, and from the bottom-up with your pelvis being pulled up towards your rib cage," Cavaliere ...
Russian twists are a popular ab exercise for working the oblique muscles on the sides of the body. But common mistakes, like going too fast or using too much weight, can make the exercise less ...
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