only appear taller and more secure, but actually feel more powerful, more graceful? To get an objective analysis of my alignment, I visit Sinead FitzGibbon, a Long Island?based physical therapist known for working with triathletes to improve their form. FitzGibbon takes out a self-leveling laser light, the type used by construction workers, and beams a vertical red line up a blank white wall. She has me stand in profile along the red light to track where it intersects my body. Ideally, she says, we should see a plumb line from the middle of my ear through the shoulder, hip, knee, and ankle. We don't. My shoulders are well in front of the bright stripe and my ankles far on the other side. "You push your chest and stomach out and arch your back. Your body is like a question mark," she says, noting that I also stand with more weight on one foot. Next she measures the rise of my shoulders when I lie flat on a table: one is two inches high, the other two and a half (more typical is one and a half). So I'm rounded forward and lopsided, which explains the band of tension I often feel across my back. Chronic postural imbalance stresses muscle tissue, potentially leading to micro-trauma to bones and joints, a factor in arthritis. Chest-opening stretches and other exercises can help, FitzGibbon says, but to really make a lasting change, I'm going to have to undo deeply ingrained patterns?to rethink, literally, how