Plank with a twist
This plank exercise will tone up your entire body while also whittling your middle to help shape a more hourglass frame. Start in a plank position with your arms fully extended. Lift one foot off the floor, and bring your knee forward under and across your body. Twist toward your opposite side. Return to start and repeat on the other side. Do 12 reps on each side.
Photo Credit: Girls Gone Sporty