Planks are a POPSUGAR Fitness favorite because they really target your upper body and core. Plus there are so many challenging variations such as plank jumping jacks and walking elbow plank, so you mix up your routine and never get bored. Here's another variation that will really work your lower abs, so grab an exercise ball and give it a try.
- Kneel down on the floor and place your forearms on a gym ball.
- Straighten your legs behind you.
- Keeping your core strong and your body still, use your arms to roll the ball in small counter-clockwise circles. Do five circles in this direction, and five clockwise. This counts as one set. Complete three sets without any breaks if you can.