Memorial Day weekend marks the start of summer and the beginning of road trip season. Despite the rising gas prices, millions of fun-seekers will hit the pavement with luggage in the trunk and the navigation system set for some distant destination. As the miles add up, so too will the pain from sitting long hours in the car. At mile marker 100, the low back may start seizing-up. At mile marker 180, cramps might be felt in the legs and shoulders. And during the final mile, the whole body might...

