This exercise is safe, effective and an excellent way to develop core and lower body strength. It may look easy, but give it a try and you'll notice that the longer you hold it, the more intense and challenging it becomes.
Stand with your back against a flat wall. Your shoulders and hips should touch the wall. Walk your feet forward, hip-width apart. Bend your knees and slide down until your hips come close to knee level with your back still pressing against the wall. Raise your arms out in front of you, parallel to the ground. Hold for 10 seconds.
Voight is the creator of a line of fitness DVDs, including "Sleek Essentials."