DOING THIS ONE 2-4 MINUTE EXERCISE MELTS BELLY FAT
Because you must work your body a bit harder each day, it works to build strength and create lasting changes. Plus, you will likely feel the burn in other parts of your body that you use during this exercise, such as your legs and arms. The challenge begins at Week One with just 30-45 second holds, but it builds over time onto the final week, where you will hold the planks for 3-4 minutes at a time.