The human body generally comes with complicated machinery – muscles, tendons, ligaments, joints, bones – to enable you to walk and run. Your ability to run efficiently and injury free depends in part on the alignment and operation of these moving parts. Your individual biomechanics are partly determined by your genes, but also by your lifestyle, past injuries, treatment and exercises. Running shoes vary according to the way and extent to which they compensate for faulty biomechanics, and your choice of running shoes should depend on your personal biomechanical profile.