We all want rock hard abs, which is why I love to hate this exercise, the plank. If done properly, the plank engages the abdominal muscles as well as the muscles that support the spine. Contrary to popular thought, you should not try to hold this position for as long as you can, but rather focus on form and break up the hold time into 10 second intervals with a 3 second rest in between. That way you put less stress on you lower back and are able to target that gut you want to ditch. The plank is an effective exercise that you can add to your daily routine.