Think about a motor vehicle. Even if you buy the best engine and body parts, you still need a mechanic to build and fine-tune the vehicle for it to be fully functional and operate at its best potential.  Similarly, our body alignment as we move is the framework within which all our different muscles perform their respective roles.  Incorrect alignment habits affect the body's performance level and injury risk in athletic pursuits, exercise and daily life activities.  Moving with incorrect alignment also tends to place unnecessary stress on important joints, causing cumulative wear and tear that can eventually lead to pain and mobility issues later in life.